diff --git a/backend-api/cmd/api/main.go b/backend-api/cmd/api/main.go
index fa5f7c0..dc73cc1 100644
--- a/backend-api/cmd/api/main.go
+++ b/backend-api/cmd/api/main.go
@@ -243,6 +243,10 @@ func buildRouter(
 	if _, err := freight.RecoverInterrupted(ctx); err != nil {
 		return nil, err
 	}
+	procurement, err := usecase.NewProcurementService(store, clock, ids)
+	if err != nil {
+		return nil, err
+	}
 	passwords, err := password.NewBcrypt(12)
 	if err != nil {
 		return nil, err
@@ -280,6 +284,7 @@ func buildRouter(
 	if err != nil {
 		return nil, err
 	}
+	webService.SetProcurement(procurement)
 	renderer, err := webui.NewRenderer()
 	if err != nil {
 		return nil, err
@@ -322,6 +327,7 @@ func buildRouter(
 			Results:        results,
 			Authorizations: authorizations,
 			Freight:        freight,
+			Procurement:    procurement,
 		},
 		webHandler,
 	)
diff --git a/backend-api/internal/domain/procurement.go b/backend-api/internal/domain/procurement.go
new file mode 100644
index 0000000..bf64f4e
--- /dev/null
+++ b/backend-api/internal/domain/procurement.go
@@ -0,0 +1,58 @@
+package domain
+
+import "time"
+
+type ProcurementRequestStatus string
+
+const (
+	ProcurementBlocked       ProcurementRequestStatus = "BLOCKED"
+	ProcurementNeedsImage    ProcurementRequestStatus = "NEEDS_IMAGE"
+	ProcurementReady         ProcurementRequestStatus = "READY"
+	ProcurementTaskCreated   ProcurementRequestStatus = "TASK_CREATED"
+	ProcurementSourceChanged ProcurementRequestStatus = "SOURCE_CHANGED"
+)
+
+const (
+	ProcurementBlockSourceCanceled   = "SOURCE_CANCELED"
+	ProcurementBlockTitleRequired    = "TITLE_REQUIRED"
+	ProcurementBlockSKURequired      = "SKU_REQUIRED"
+	ProcurementBlockQuantityRequired = "QUANTITY_REQUIRED"
+	ProcurementBlockSourceChanged    = "SOURCE_CHANGED"
+)
+
+type ProcurementSourceItem struct {
+	Item       FreightOrderItem
+	IsCanceled *bool
+}
+
+type ProcurementRequest struct {
+	ID                           string
+	CreatorSubject               string
+	FreightOrderItemID           string
+	SourceRevision               int
+	SourceSHA256                 string
+	Title                        string
+	ProductSpec                  string
+	SKU                          string
+	Quantity                     *int
+	SourcePurchaseStatus         *string
+	SourceIsCanceled             *bool
+	ProcurementConfirmedByUserID string
+	ProcurementConfirmedAt       time.Time
+	Status                       ProcurementRequestStatus
+	BlockingCode                 *string
+	ReferenceAssetID             *string
+	PurchaseTaskID               *string
+	SourceChanged                bool
+	CreatedAt                    time.Time
+	UpdatedAt                    time.Time
+}
+
+type PurchaseTaskSource struct {
+	TaskID               string
+	ProcurementRequestID string
+	FreightOrderItemID   string
+	SourceRevision       int
+	SourceSHA256         string
+	CreatedAt            time.Time
+}
diff --git a/backend-api/internal/platform/migration/claims_migration_test.go b/backend-api/internal/platform/migration/claims_migration_test.go
index 7a1dfb7..37a996a 100644
--- a/backend-api/internal/platform/migration/claims_migration_test.go
+++ b/backend-api/internal/platform/migration/claims_migration_test.go
@@ -34,8 +34,11 @@ func TestClaimsMigrationPreservesHistoryAcrossUpDownUp(t *testing.T) {
 
 	if applied, err := runner.Up(ctx); err != nil {
 		t.Fatalf("initial Up() error = %v", err)
-	} else if applied != 12 {
-		t.Fatalf("initial Up() applied = %d, want 12", applied)
+	} else if applied != 13 {
+		t.Fatalf("initial Up() applied = %d, want 13", applied)
+	}
+	if err := runner.Down(ctx); err != nil {
+		t.Fatalf("initial Down(v13) error = %v", err)
 	}
 	if err := runner.Down(ctx); err != nil {
 		t.Fatalf("initial Down(v12) error = %v", err)
@@ -65,9 +68,14 @@ func TestClaimsMigrationPreservesHistoryAcrossUpDownUp(t *testing.T) {
 	seedClaimsHistoricalFixture(t, db)
 
 	if applied, err := runner.Up(ctx); err != nil {
-		t.Fatalf("Up(v5-v12) over historical data error = %v", err)
-	} else if applied != 8 {
-		t.Fatalf("Up(v5-v12) applied = %d, want 8", applied)
+		t.Fatalf("Up(v5-v13) over historical data error = %v", err)
+	} else if applied != 9 {
+		t.Fatalf("Up(v5-v13) applied = %d, want 9", applied)
+	}
+	assertClaimsHistory(t, db, true)
+
+	if err := runner.Down(ctx); err != nil {
+		t.Fatalf("Down(v13) with compatible history error = %v", err)
 	}
 	assertClaimsHistory(t, db, true)
 
@@ -117,9 +125,9 @@ func TestClaimsMigrationPreservesHistoryAcrossUpDownUp(t *testing.T) {
 	assertClaimsHistory(t, db, false)
 
 	if applied, err := runner.Up(ctx); err != nil {
-		t.Fatalf("final Up(v4-v12) error = %v", err)
-	} else if applied != 9 {
-		t.Fatalf("final Up(v4-v12) applied = %d, want 9", applied)
+		t.Fatalf("final Up(v4-v13) error = %v", err)
+	} else if applied != 10 {
+		t.Fatalf("final Up(v4-v13) applied = %d, want 10", applied)
 	}
 	assertClaimsHistory(t, db, true)
 }
@@ -355,6 +363,9 @@ func TestClaimsMigrationDownFailsClosedForNewAuditData(t *testing.T) {
 		t.Fatalf("insert v4 audit event: %v", err)
 	}
 
+	if err := runner.Down(ctx); err != nil {
+		t.Fatalf("Down(v13) error = %v", err)
+	}
 	if err := runner.Down(ctx); err != nil {
 		t.Fatalf("Down(v12) error = %v", err)
 	}
diff --git a/backend-api/internal/platform/migration/runner_test.go b/backend-api/internal/platform/migration/runner_test.go
index c219091..4ad63b8 100644
--- a/backend-api/internal/platform/migration/runner_test.go
+++ b/backend-api/internal/platform/migration/runner_test.go
@@ -27,8 +27,8 @@ func TestRunnerSupportsUpStatusDownAndIdempotentUp(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Up() error = %v", err)
 	}
-	if applied != 12 {
-		t.Fatalf("Up() applied = %d, want 12", applied)
+	if applied != 13 {
+		t.Fatalf("Up() applied = %d, want 13", applied)
 	}
 	assertStatuses(t, runner, map[int64]bool{
 		1:  true,
@@ -43,6 +43,7 @@ func TestRunnerSupportsUpStatusDownAndIdempotentUp(t *testing.T) {
 		10: true,
 		11: true,
 		12: true,
+		13: true,
 	})
 
 	applied, err = runner.Up(context.Background())
@@ -68,7 +69,8 @@ func TestRunnerSupportsUpStatusDownAndIdempotentUp(t *testing.T) {
 		9:  true,
 		10: true,
 		11: true,
-		12: false,
+		12: true,
+		13: false,
 	})
 
 	applied, err = runner.Up(context.Background())
@@ -91,6 +93,7 @@ func TestRunnerSupportsUpStatusDownAndIdempotentUp(t *testing.T) {
 		10: true,
 		11: true,
 		12: true,
+		13: true,
 	})
 }
 
diff --git a/backend-api/internal/repository/sqlite/auth_repository_test.go b/backend-api/internal/repository/sqlite/auth_repository_test.go
index 1e9bef1..9830d0f 100644
--- a/backend-api/internal/repository/sqlite/auth_repository_test.go
+++ b/backend-api/internal/repository/sqlite/auth_repository_test.go
@@ -383,6 +383,9 @@ func TestAuthMigrationCanRollbackWithoutRebuildingPurchaseTasks(
 	if err != nil {
 		t.Fatalf("migration.New() error = %v", err)
 	}
+	if err := runner.Down(context.Background()); err != nil {
+		t.Fatalf("Down(v13) error = %v", err)
+	}
 	if err := runner.Down(context.Background()); err != nil {
 		t.Fatalf("Down(v12) error = %v", err)
 	}
@@ -426,9 +429,9 @@ func TestAuthMigrationCanRollbackWithoutRebuildingPurchaseTasks(
 		t.Fatal("purchase_tasks was lost during auth migration rollback")
 	}
 	if applied, err := runner.Up(context.Background()); err != nil {
-		t.Fatalf("Up(v3-v12) error = %v", err)
-	} else if applied != 10 {
-		t.Fatalf("Up(v3-v12) applied = %d, want 10", applied)
+		t.Fatalf("Up(v3-v13) error = %v", err)
+	} else if applied != 11 {
+		t.Fatalf("Up(v3-v13) applied = %d, want 11", applied)
 	}
 }
 
diff --git a/backend-api/internal/repository/sqlite/freight_repository_test.go b/backend-api/internal/repository/sqlite/freight_repository_test.go
index d251bb7..84d4a15 100644
--- a/backend-api/internal/repository/sqlite/freight_repository_test.go
+++ b/backend-api/internal/repository/sqlite/freight_repository_test.go
@@ -117,6 +117,9 @@ func TestFreightImportIsAtomicIdempotentAndRevisioned(t *testing.T) {
 	if err != nil {
 		t.Fatalf("migration.New() error = %v", err)
 	}
+	if err := runner.Down(ctx); err != nil {
+		t.Fatalf("procurement migration down: %v", err)
+	}
 	if err := runner.Down(ctx); err == nil {
 		t.Fatal("freight migration down succeeded with retained source data")
 	}
diff --git a/backend-api/internal/repository/sqlite/procurement_repository.go b/backend-api/internal/repository/sqlite/procurement_repository.go
new file mode 100644
index 0000000..d2215d5
--- /dev/null
+++ b/backend-api/internal/repository/sqlite/procurement_repository.go
@@ -0,0 +1,632 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"time"
+
+	"cmroubao/backend-api/internal/domain"
+	"cmroubao/backend-api/internal/usecase"
+)
+
+const createProcurementTaskOperation = "CREATE_PROCUREMENT_TASK"
+
+func (store *Store) GetProcurementSourceItem(
+	ctx context.Context,
+	creatorSubject, itemID string,
+) (domain.ProcurementSourceItem, error) {
+	item, err := scanFreightOrderItem(store.db.QueryRowContext(
+		ctx,
+		`SELECT
+			item.id, item.freight_order_id, item.external_item_id,
+			item.title, item.product_spec, item.sku, item.quantity,
+			item.product_thumb_ref, item.purchase_status,
+			item.canonical_sha256, item.revision, item.is_present,
+			item.first_sync_run_id, item.last_sync_run_id,
+			item.created_at, item.updated_at
+		FROM freight_order_items AS item
+		JOIN freight_orders AS freight
+			ON freight.id = item.freight_order_id
+		WHERE freight.creator_subject = ? AND item.id = ?
+			AND item.is_present = 1`,
+		creatorSubject,
+		itemID,
+	))
+	if errors.Is(err, sql.ErrNoRows) {
+		return domain.ProcurementSourceItem{}, usecase.ErrRepositoryNotFound
+	}
+	if err != nil {
+		return domain.ProcurementSourceItem{}, repositoryFailure(err)
+	}
+	var canceled sql.NullBool
+	if err := store.db.QueryRowContext(
+		ctx,
+		`SELECT freight.is_canceled
+		FROM freight_orders AS freight
+		JOIN freight_order_items AS item
+			ON item.freight_order_id = freight.id
+		WHERE freight.creator_subject = ? AND item.id = ?`,
+		creatorSubject,
+		itemID,
+	).Scan(&canceled); err != nil {
+		return domain.ProcurementSourceItem{}, repositoryFailure(err)
+	}
+	var isCanceled *bool
+	if canceled.Valid {
+		isCanceled = &canceled.Bool
+	}
+	return domain.ProcurementSourceItem{
+		Item:       item,
+		IsCanceled: isCanceled,
+	}, nil
+}
+
+func (store *Store) CreateProcurementRequest(
+	ctx context.Context,
+	candidate domain.ProcurementRequest,
+) (domain.ProcurementRequest, bool, error) {
+	tx, err := store.db.BeginTx(ctx, nil)
+	if err != nil {
+		return domain.ProcurementRequest{}, false, repositoryFailure(err)
+	}
+	defer tx.Rollback()
+	existing, err := getProcurementRequestBySource(
+		ctx,
+		tx,
+		candidate.CreatorSubject,
+		candidate.FreightOrderItemID,
+		candidate.SourceRevision,
+	)
+	if err == nil {
+		if err := tx.Commit(); err != nil {
+			return domain.ProcurementRequest{}, false, repositoryFailure(err)
+		}
+		return existing, false, nil
+	}
+	if !errors.Is(err, usecase.ErrRepositoryNotFound) {
+		return domain.ProcurementRequest{}, false, err
+	}
+	var currentRevision int
+	var currentSHA string
+	var present bool
+	if err := tx.QueryRowContext(
+		ctx,
+		`SELECT item.revision, item.canonical_sha256, item.is_present
+		FROM freight_order_items AS item
+		JOIN freight_orders AS freight
+			ON freight.id = item.freight_order_id
+		WHERE freight.creator_subject = ? AND item.id = ?`,
+		candidate.CreatorSubject,
+		candidate.FreightOrderItemID,
+	).Scan(&currentRevision, &currentSHA, &present); err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return domain.ProcurementRequest{}, false, usecase.ErrRepositoryNotFound
+		}
+		return domain.ProcurementRequest{}, false, repositoryFailure(err)
+	}
+	if !present || currentRevision != candidate.SourceRevision ||
+		currentSHA != candidate.SourceSHA256 {
+		return domain.ProcurementRequest{}, false,
+			usecase.ErrProcurementSourceChanged
+	}
+	_, err = tx.ExecContext(
+		ctx,
+		`INSERT INTO procurement_requests (
+			id, creator_subject, freight_order_item_id, source_revision,
+			source_sha256, title, product_spec, sku, quantity,
+			source_purchase_status, source_is_canceled,
+			procurement_confirmed_by_user_id, procurement_confirmed_at,
+			status, blocking_code, reference_asset_id, purchase_task_id,
+			created_at, updated_at
+		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, NULL, NULL, ?, ?)`,
+		candidate.ID,
+		candidate.CreatorSubject,
+		candidate.FreightOrderItemID,
+		candidate.SourceRevision,
+		candidate.SourceSHA256,
+		candidate.Title,
+		candidate.ProductSpec,
+		candidate.SKU,
+		nullableFreightQuantity(candidate.Quantity),
+		nullableString(candidate.SourcePurchaseStatus),
+		nullableBool(candidate.SourceIsCanceled),
+		candidate.ProcurementConfirmedByUserID,
+		formatTimestamp(candidate.ProcurementConfirmedAt),
+		candidate.Status,
+		nullableString(candidate.BlockingCode),
+		formatTimestamp(candidate.CreatedAt),
+		formatTimestamp(candidate.UpdatedAt),
+	)
+	if err != nil {
+		return domain.ProcurementRequest{}, false, repositoryFailure(err)
+	}
+	if err := tx.Commit(); err != nil {
+		return domain.ProcurementRequest{}, false, repositoryFailure(err)
+	}
+	return candidate, true, nil
+}
+
+func (store *Store) ListProcurementRequestsForOrder(
+	ctx context.Context,
+	creatorSubject, orderID string,
+) ([]domain.ProcurementRequest, error) {
+	rows, err := store.db.QueryContext(
+		ctx,
+		procurementRequestSelect+`
+		WHERE request.creator_subject = ?
+			AND item.freight_order_id = ?
+		ORDER BY item.id, request.source_revision DESC, request.id DESC`,
+		creatorSubject,
+		orderID,
+	)
+	if err != nil {
+		return nil, repositoryFailure(err)
+	}
+	defer rows.Close()
+	requests := make([]domain.ProcurementRequest, 0)
+	for rows.Next() {
+		request, err := scanProcurementRequest(rows)
+		if err != nil {
+			return nil, repositoryFailure(err)
+		}
+		requests = append(requests, request)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, repositoryFailure(err)
+	}
+	return requests, nil
+}
+
+func (store *Store) GetProcurementRequest(
+	ctx context.Context,
+	creatorSubject, requestID string,
+) (domain.ProcurementRequest, error) {
+	return getProcurementRequest(ctx, store.db, creatorSubject, requestID)
+}
+
+func (store *Store) BindProcurementReference(
+	ctx context.Context,
+	creatorSubject, requestID, assetID string,
+	now time.Time,
+) (domain.ProcurementRequest, error) {
+	tx, err := store.db.BeginTx(ctx, nil)
+	if err != nil {
+		return domain.ProcurementRequest{}, repositoryFailure(err)
+	}
+	defer tx.Rollback()
+	request, err := getProcurementRequest(
+		ctx,
+		tx,
+		creatorSubject,
+		requestID,
+	)
+	if err != nil {
+		return domain.ProcurementRequest{}, err
+	}
+	if request.SourceChanged {
+		if request.PurchaseTaskID == nil {
+			if err := markProcurementSourceChanged(ctx, tx, request.ID, now); err != nil {
+				return domain.ProcurementRequest{}, err
+			}
+		}
+		if err := tx.Commit(); err != nil {
+			return domain.ProcurementRequest{}, repositoryFailure(err)
+		}
+		return domain.ProcurementRequest{}, usecase.ErrProcurementSourceChanged
+	}
+	if request.ReferenceAssetID != nil &&
+		*request.ReferenceAssetID == assetID &&
+		(request.Status == domain.ProcurementReady ||
+			request.Status == domain.ProcurementTaskCreated) {
+		if err := tx.Commit(); err != nil {
+			return domain.ProcurementRequest{}, repositoryFailure(err)
+		}
+		return request, nil
+	}
+	if request.Status != domain.ProcurementNeedsImage {
+		return domain.ProcurementRequest{}, usecase.ErrProcurementStateConflict
+	}
+	var available int
+	if err := tx.QueryRowContext(
+		ctx,
+		`SELECT EXISTS (
+			SELECT 1
+			FROM assets AS asset
+			WHERE asset.id = ? AND asset.creator_subject = ?
+				AND asset.purpose = 'TASK_REFERENCE'
+				AND NOT EXISTS (
+					SELECT 1 FROM purchase_tasks AS task
+					WHERE task.image_asset_id = asset.id
+				)
+				AND NOT EXISTS (
+					SELECT 1 FROM procurement_requests AS other
+					WHERE other.reference_asset_id = asset.id
+						AND other.id != ?
+				)
+		)`,
+		assetID,
+		creatorSubject,
+		requestID,
+	).Scan(&available); err != nil {
+		return domain.ProcurementRequest{}, repositoryFailure(err)
+	}
+	if available != 1 {
+		return domain.ProcurementRequest{}, usecase.ErrAssetUnavailable
+	}
+	if _, err := tx.ExecContext(
+		ctx,
+		`UPDATE procurement_requests
+		SET reference_asset_id = ?, status = 'READY', updated_at = ?
+		WHERE id = ? AND status = 'NEEDS_IMAGE'`,
+		assetID,
+		formatTimestamp(now),
+		requestID,
+	); err != nil {
+		return domain.ProcurementRequest{}, repositoryFailure(err)
+	}
+	updated, err := getProcurementRequest(ctx, tx, creatorSubject, requestID)
+	if err != nil {
+		return domain.ProcurementRequest{}, err
+	}
+	if err := tx.Commit(); err != nil {
+		return domain.ProcurementRequest{}, repositoryFailure(err)
+	}
+	return updated, nil
+}
+
+func (store *Store) CreateProcurementTask(
+	ctx context.Context,
+	expected domain.ProcurementRequest,
+	task domain.PurchaseTask,
+	event domain.TaskEvent,
+	source domain.PurchaseTaskSource,
+	idempotencyKey, requestSHA256 string,
+) (domain.PurchaseTask, bool, error) {
+	tx, err := store.db.BeginTx(ctx, nil)
+	if err != nil {
+		return domain.PurchaseTask{}, false, repositoryFailure(err)
+	}
+	defer tx.Rollback()
+	existingHash, resourceID, found, err := lookupIdempotency(
+		ctx,
+		tx,
+		task.CreatorSubject,
+		createProcurementTaskOperation,
+		idempotencyKey,
+	)
+	if err != nil {
+		return domain.PurchaseTask{}, false, err
+	}
+	if found {
+		if existingHash != requestSHA256 {
+			return domain.PurchaseTask{}, false, usecase.ErrIdempotencyConflict
+		}
+		existing, err := getTaskByID(
+			ctx,
+			tx,
+			task.CreatorSubject,
+			resourceID,
+		)
+		if err != nil {
+			return domain.PurchaseTask{}, false, err
+		}
+		if err := tx.Commit(); err != nil {
+			return domain.PurchaseTask{}, false, repositoryFailure(err)
+		}
+		return existing, false, nil
+	}
+	request, err := getProcurementRequest(
+		ctx,
+		tx,
+		task.CreatorSubject,
+		expected.ID,
+	)
+	if err != nil {
+		return domain.PurchaseTask{}, false, err
+	}
+	if request.Status == domain.ProcurementTaskCreated &&
+		request.PurchaseTaskID != nil {
+		existing, err := getTaskByID(
+			ctx,
+			tx,
+			task.CreatorSubject,
+			*request.PurchaseTaskID,
+		)
+		if err != nil {
+			return domain.PurchaseTask{}, false, err
+		}
+		if err := insertIdempotency(
+			ctx,
+			tx,
+			task.CreatorSubject,
+			createProcurementTaskOperation,
+			idempotencyKey,
+			requestSHA256,
+			"PURCHASE_TASK",
+			existing.ID,
+			task.CreatedAt,
+		); err != nil {
+			return domain.PurchaseTask{}, false, err
+		}
+		if err := tx.Commit(); err != nil {
+			return domain.PurchaseTask{}, false, repositoryFailure(err)
+		}
+		return existing, false, nil
+	}
+	if request.SourceChanged {
+		if request.PurchaseTaskID == nil {
+			if err := markProcurementSourceChanged(
+				ctx,
+				tx,
+				request.ID,
+				task.CreatedAt,
+			); err != nil {
+				return domain.PurchaseTask{}, false, err
+			}
+		}
+		if err := tx.Commit(); err != nil {
+			return domain.PurchaseTask{}, false, repositoryFailure(err)
+		}
+		return domain.PurchaseTask{}, false,
+			usecase.ErrProcurementSourceChanged
+	}
+	if request.Status != domain.ProcurementReady ||
+		request.ReferenceAssetID == nil ||
+		request.SourceSHA256 != expected.SourceSHA256 {
+		return domain.PurchaseTask{}, false,
+			usecase.ErrProcurementStateConflict
+	}
+	var assetAvailable int
+	if err := tx.QueryRowContext(
+		ctx,
+		`SELECT EXISTS (
+			SELECT 1 FROM assets AS asset
+			WHERE asset.id = ? AND asset.creator_subject = ?
+				AND asset.purpose = 'TASK_REFERENCE'
+				AND NOT EXISTS (
+					SELECT 1 FROM purchase_tasks AS other
+					WHERE other.image_asset_id = asset.id
+				)
+		)`,
+		*request.ReferenceAssetID,
+		task.CreatorSubject,
+	).Scan(&assetAvailable); err != nil {
+		return domain.PurchaseTask{}, false, repositoryFailure(err)
+	}
+	if assetAvailable != 1 {
+		return domain.PurchaseTask{}, false, usecase.ErrAssetUnavailable
+	}
+	_, err = tx.ExecContext(
+		ctx,
+		`INSERT INTO purchase_tasks (
+			id, creator_subject, created_by_user_id, source_ref, title,
+			description, sku, image_asset_id, quantity, max_budget_cents,
+			currency, status, version, cancel_reason, canceled_at,
+			created_at, updated_at
+		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, NULL, 'CNY', 'PENDING', 1,
+			NULL, NULL, ?, ?)`,
+		task.ID,
+		task.CreatorSubject,
+		nullableString(task.CreatedByUserID),
+		nullableString(task.SourceRef),
+		task.Title,
+		task.Description,
+		task.SKU,
+		task.ImageAssetID,
+		task.Quantity,
+		formatTimestamp(task.CreatedAt),
+		formatTimestamp(task.UpdatedAt),
+	)
+	if err != nil {
+		return domain.PurchaseTask{}, false, repositoryFailure(err)
+	}
+	if err := insertTaskEvent(ctx, tx, event); err != nil {
+		return domain.PurchaseTask{}, false, err
+	}
+	_, err = tx.ExecContext(
+		ctx,
+		`INSERT INTO purchase_task_sources (
+			task_id, procurement_request_id, freight_order_item_id,
+			source_revision, source_sha256, created_at
+		) VALUES (?, ?, ?, ?, ?, ?)`,
+		source.TaskID,
+		source.ProcurementRequestID,
+		source.FreightOrderItemID,
+		source.SourceRevision,
+		source.SourceSHA256,
+		formatTimestamp(source.CreatedAt),
+	)
+	if err != nil {
+		return domain.PurchaseTask{}, false, repositoryFailure(err)
+	}
+	result, err := tx.ExecContext(
+		ctx,
+		`UPDATE procurement_requests
+		SET status = 'TASK_CREATED', purchase_task_id = ?, updated_at = ?
+		WHERE id = ? AND status = 'READY'`,
+		task.ID,
+		formatTimestamp(task.CreatedAt),
+		request.ID,
+	)
+	if err != nil {
+		return domain.PurchaseTask{}, false, repositoryFailure(err)
+	}
+	changed, err := result.RowsAffected()
+	if err != nil {
+		return domain.PurchaseTask{}, false, repositoryFailure(err)
+	}
+	if changed != 1 {
+		return domain.PurchaseTask{}, false,
+			usecase.ErrProcurementStateConflict
+	}
+	if err := insertIdempotency(
+		ctx,
+		tx,
+		task.CreatorSubject,
+		createProcurementTaskOperation,
+		idempotencyKey,
+		requestSHA256,
+		"PURCHASE_TASK",
+		task.ID,
+		task.CreatedAt,
+	); err != nil {
+		return domain.PurchaseTask{}, false, err
+	}
+	if err := tx.Commit(); err != nil {
+		return domain.PurchaseTask{}, false, repositoryFailure(err)
+	}
+	return task, true, nil
+}
+
+const procurementRequestSelect = `SELECT
+	request.id, request.creator_subject, request.freight_order_item_id,
+	request.source_revision, request.source_sha256, request.title,
+	request.product_spec, request.sku, request.quantity,
+	request.source_purchase_status, request.source_is_canceled,
+	request.procurement_confirmed_by_user_id,
+	request.procurement_confirmed_at, request.status,
+	request.blocking_code, request.reference_asset_id,
+	request.purchase_task_id, request.created_at, request.updated_at,
+	CASE
+		WHEN item.revision != request.source_revision
+			OR item.canonical_sha256 != request.source_sha256
+			OR item.is_present != 1
+			OR COALESCE(freight.is_canceled, -1)
+				!= COALESCE(request.source_is_canceled, -1)
+		THEN 1 ELSE 0
+	END
+	FROM procurement_requests AS request
+	JOIN freight_order_items AS item
+		ON item.id = request.freight_order_item_id
+	JOIN freight_orders AS freight
+		ON freight.id = item.freight_order_id
+	`
+
+func getProcurementRequest(
+	ctx context.Context,
+	query queryRower,
+	creatorSubject, requestID string,
+) (domain.ProcurementRequest, error) {
+	request, err := scanProcurementRequest(query.QueryRowContext(
+		ctx,
+		procurementRequestSelect+`
+		WHERE request.creator_subject = ? AND request.id = ?`,
+		creatorSubject,
+		requestID,
+	))
+	if errors.Is(err, sql.ErrNoRows) {
+		return domain.ProcurementRequest{}, usecase.ErrRepositoryNotFound
+	}
+	if err != nil {
+		return domain.ProcurementRequest{}, repositoryFailure(err)
+	}
+	return request, nil
+}
+
+func getProcurementRequestBySource(
+	ctx context.Context,
+	query queryRower,
+	creatorSubject, itemID string,
+	revision int,
+) (domain.ProcurementRequest, error) {
+	request, err := scanProcurementRequest(query.QueryRowContext(
+		ctx,
+		procurementRequestSelect+`
+		WHERE request.creator_subject = ?
+			AND request.freight_order_item_id = ?
+			AND request.source_revision = ?`,
+		creatorSubject,
+		itemID,
+		revision,
+	))
+	if errors.Is(err, sql.ErrNoRows) {
+		return domain.ProcurementRequest{}, usecase.ErrRepositoryNotFound
+	}
+	if err != nil {
+		return domain.ProcurementRequest{}, repositoryFailure(err)
+	}
+	return request, nil
+}
+
+func scanProcurementRequest(
+	scanner rowScanner,
+) (domain.ProcurementRequest, error) {
+	var request domain.ProcurementRequest
+	var quantity sql.NullInt64
+	var purchaseStatus sql.NullString
+	var isCanceled sql.NullBool
+	var blockingCode, assetID, taskID sql.NullString
+	var confirmedAt, createdAt, updatedAt string
+	var sourceChanged bool
+	err := scanner.Scan(
+		&request.ID,
+		&request.CreatorSubject,
+		&request.FreightOrderItemID,
+		&request.SourceRevision,
+		&request.SourceSHA256,
+		&request.Title,
+		&request.ProductSpec,
+		&request.SKU,
+		&quantity,
+		&purchaseStatus,
+		&isCanceled,
+		&request.ProcurementConfirmedByUserID,
+		&confirmedAt,
+		&request.Status,
+		&blockingCode,
+		&assetID,
+		&taskID,
+		&createdAt,
+		&updatedAt,
+		&sourceChanged,
+	)
+	if err != nil {
+		return domain.ProcurementRequest{}, err
+	}
+	if quantity.Valid {
+		value := int(quantity.Int64)
+		request.Quantity = &value
+	}
+	request.SourcePurchaseStatus = optionalString(purchaseStatus)
+	if isCanceled.Valid {
+		request.SourceIsCanceled = &isCanceled.Bool
+	}
+	request.BlockingCode = optionalString(blockingCode)
+	request.ReferenceAssetID = optionalString(assetID)
+	request.PurchaseTaskID = optionalString(taskID)
+	request.SourceChanged = sourceChanged
+	request.ProcurementConfirmedAt, err = parseTimestamp(confirmedAt)
+	if err != nil {
+		return domain.ProcurementRequest{}, err
+	}
+	request.CreatedAt, err = parseTimestamp(createdAt)
+	if err != nil {
+		return domain.ProcurementRequest{}, err
+	}
+	request.UpdatedAt, err = parseTimestamp(updatedAt)
+	return request, err
+}
+
+func markProcurementSourceChanged(
+	ctx context.Context,
+	tx *sql.Tx,
+	requestID string,
+	now time.Time,
+) error {
+	_, err := tx.ExecContext(
+		ctx,
+		`UPDATE procurement_requests
+		SET status = 'SOURCE_CHANGED', blocking_code = 'SOURCE_CHANGED',
+			updated_at = ?
+		WHERE id = ? AND purchase_task_id IS NULL`,
+		formatTimestamp(now),
+		requestID,
+	)
+	if err != nil {
+		return repositoryFailure(err)
+	}
+	return nil
+}
+
+var _ usecase.ProcurementRepository = (*Store)(nil)
diff --git a/backend-api/internal/repository/sqlite/procurement_repository_test.go b/backend-api/internal/repository/sqlite/procurement_repository_test.go
new file mode 100644
index 0000000..df7bb99
--- /dev/null
+++ b/backend-api/internal/repository/sqlite/procurement_repository_test.go
@@ -0,0 +1,325 @@
+package sqlite_test
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"cmroubao/backend-api/internal/domain"
+	"cmroubao/backend-api/internal/platform/migration"
+	repository "cmroubao/backend-api/internal/repository/sqlite"
+	"cmroubao/backend-api/internal/usecase"
+)
+
+func TestProcurementRequestsArePerItemAndTaskSnapshotIsImmutable(
+	t *testing.T,
+) {
+	db := openDatabase(t)
+	store, _ := repository.New(db)
+	ctx := context.Background()
+	now := time.Date(2026, 7, 28, 5, 6, 7, 0, time.UTC)
+	userID := uuid(1100)
+	seedFreightUser(t, db, userID, now)
+	run := freightRun(1101, userID, now)
+	createAndStartFreightRun(t, store, run, "procurement-source-1", "1")
+	if err := store.CompleteFreightSync(
+		ctx,
+		run,
+		freightBatch(1110, "a", "b"),
+		now.Add(time.Second),
+	); err != nil {
+		t.Fatalf("CompleteFreightSync() error = %v", err)
+	}
+	orders, _ := store.ListFreightOrders(ctx, "local-admin", 10)
+	detail, _ := store.GetFreightOrder(ctx, "local-admin", orders[0].ID)
+	service, err := usecase.NewProcurementService(
+		store,
+		procurementClock{now: now.Add(2 * time.Second)},
+		&procurementIDs{next: 1200},
+	)
+	if err != nil {
+		t.Fatalf("NewProcurementService() error = %v", err)
+	}
+	requests := make([]domain.ProcurementRequest, 0, len(detail.Items))
+	for _, item := range detail.Items {
+		result, err := service.CreateRequest(
+			ctx,
+			usecase.CreateProcurementRequestCommand{
+				CreatorSubject:           "local-admin",
+				ActorUserID:              userID,
+				FreightOrderItemID:       item.ID,
+				ConfirmProcurementNeeded: true,
+			},
+		)
+		if err != nil || result.Request.Status !=
+			domain.ProcurementNeedsImage {
+			t.Fatalf("CreateRequest() = %+v, %v", result, err)
+		}
+		requests = append(requests, result.Request)
+	}
+	if len(requests) != 2 || requests[0].ID == requests[1].ID {
+		t.Fatalf("requests = %+v", requests)
+	}
+	replay, err := service.CreateRequest(
+		ctx,
+		usecase.CreateProcurementRequestCommand{
+			CreatorSubject:           "local-admin",
+			ActorUserID:              userID,
+			FreightOrderItemID:       detail.Items[0].ID,
+			ConfirmProcurementNeeded: true,
+		},
+	)
+	if err != nil || !replay.Replayed ||
+		replay.Request.ID != requests[0].ID {
+		t.Fatalf("request replay = %+v, %v", replay, err)
+	}
+
+	asset := domain.Asset{
+		ID:             uuid(1300),
+		CreatorSubject: "local-admin",
+		Purpose:        domain.AssetPurposeTaskReference,
+		MediaType:      domain.NormalizedImageMediaType,
+		SizeBytes:      100,
+		SHA256:         repeatHex("f"),
+		StorageKey:     "procurement/reference.jpg",
+		CreatedAt:      now,
+	}
+	if _, _, err := store.CreateAssetIdempotent(
+		ctx,
+		asset,
+		"procurement-asset",
+		repeatHex("e"),
+	); err != nil {
+		t.Fatalf("CreateAssetIdempotent() error = %v", err)
+	}
+	bound, err := service.BindReference(
+		ctx,
+		usecase.BindProcurementReferenceCommand{
+			CreatorSubject: "local-admin",
+			ActorUserID:    userID,
+			RequestID:      requests[0].ID,
+			ImageAssetID:   asset.ID,
+		},
+	)
+	if err != nil || bound.Status != domain.ProcurementReady {
+		t.Fatalf("BindReference() = %+v, %v", bound, err)
+	}
+	created, err := service.CreateTask(
+		ctx,
+		usecase.CreateProcurementTaskCommand{
+			CreatorSubject: "local-admin",
+			ActorUserID:    userID,
+			RequestID:      requests[0].ID,
+			IdempotencyKey: "procurement-task-1",
+		},
+	)
+	if err != nil || created.Task.Status != domain.TaskStatusPending ||
+		created.Task.Title != detail.Items[0].Title ||
+		created.Task.SKU != detail.Items[0].SKU ||
+		created.Task.ImageAssetID != asset.ID {
+		t.Fatalf("CreateTask() = %+v, %v", created, err)
+	}
+	replayedTask, err := service.CreateTask(
+		ctx,
+		usecase.CreateProcurementTaskCommand{
+			CreatorSubject: "local-admin",
+			ActorUserID:    userID,
+			RequestID:      requests[0].ID,
+			IdempotencyKey: "procurement-task-2",
+		},
+	)
+	if err != nil || !replayedTask.Replayed ||
+		replayedTask.Task.ID != created.Task.ID {
+		t.Fatalf("task replay = %+v, %v", replayedTask, err)
+	}
+	buyerID := uuid(1600)
+	deviceID := uuid(1601)
+	seedLifecycleUser(
+		t,
+		db,
+		buyerID,
+		"procurement-buyer",
+		domain.UserRoleBuyer,
+		now,
+	)
+	seedLifecycleDevice(
+		t,
+		db,
+		deviceID,
+		"procurement-device",
+		buyerID,
+		repeatHex("6"),
+		now,
+	)
+	lifecycle := &lifecycleFixture{
+		store:       store,
+		db:          db,
+		buyerOneID:  buyerID,
+		deviceOneID: deviceID,
+	}
+	readyAt := now.Add(3 * time.Second)
+	recordReadyHeartbeat(t, lifecycle, buyerID, deviceID, readyAt)
+	claimed, err := store.ClaimNext(
+		ctx,
+		lifecycleClaimRequest(
+			lifecycle,
+			buyerID,
+			deviceID,
+			1602,
+			readyAt.Add(time.Second),
+			readyAt.Add(10*time.Minute),
+			readyAt.Add(-time.Minute),
+		),
+	)
+	if err != nil || claimed.Task == nil ||
+		claimed.Task.ID != created.Task.ID ||
+		claimed.Task.Status != domain.TaskStatusClaimed {
+		t.Fatalf("Roubao claim = %+v, %v", claimed, err)
+	}
+
+	updateRun := freightRun(1102, userID, now.Add(time.Minute))
+	createAndStartFreightRun(
+		t,
+		store,
+		updateRun,
+		"procurement-source-2",
+		"2",
+	)
+	changed := freightBatch(1120, "c", "b")
+	changed.Orders[0].CanonicalSHA256 = repeatHex("d")
+	changed.Orders[0].Items[0].Title = "ERP 更新后的标题"
+	changed.Orders[0].Items[0].CanonicalSHA256 = repeatHex("c")
+	if err := store.CompleteFreightSync(
+		ctx,
+		updateRun,
+		changed,
+		now.Add(time.Minute+time.Second),
+	); err != nil {
+		t.Fatalf("updated freight import error = %v", err)
+	}
+	storedRequest, err := service.Get(
+		ctx,
+		"local-admin",
+		requests[0].ID,
+	)
+	if err != nil || !storedRequest.SourceChanged ||
+		storedRequest.PurchaseTaskID == nil ||
+		*storedRequest.PurchaseTaskID != created.Task.ID {
+		t.Fatalf("source changed request = %+v, %v", storedRequest, err)
+	}
+	replayAfterUpdate, err := service.CreateTask(
+		ctx,
+		usecase.CreateProcurementTaskCommand{
+			CreatorSubject: "local-admin",
+			ActorUserID:    userID,
+			RequestID:      requests[0].ID,
+			IdempotencyKey: "procurement-task-after-source-update",
+		},
+	)
+	if err != nil || !replayAfterUpdate.Replayed ||
+		replayAfterUpdate.Task.ID != created.Task.ID {
+		t.Fatalf(
+			"task replay after source update = %+v, %v",
+			replayAfterUpdate,
+			err,
+		)
+	}
+	storedTask, err := store.GetTaskDetail(
+		ctx,
+		"local-admin",
+		created.Task.ID,
+	)
+	if err != nil || storedTask.Task.Title != detail.Items[0].Title ||
+		storedTask.Task.Title == "ERP 更新后的标题" {
+		t.Fatalf("immutable task = %+v, %v", storedTask.Task, err)
+	}
+	runner, err := migration.New(db)
+	if err != nil {
+		t.Fatalf("migration.New() error = %v", err)
+	}
+	if err := runner.Down(ctx); err == nil {
+		t.Fatal("procurement migration down succeeded with retained requests")
+	}
+	var retained int
+	if err := db.QueryRow(
+		`SELECT count(*) FROM procurement_requests`,
+	).Scan(&retained); err != nil || retained != 2 {
+		t.Fatalf("retained requests = %d, error = %v", retained, err)
+	}
+}
+
+func TestProcurementBlocksInvalidSourceAndChangedRequest(t *testing.T) {
+	db := openDatabase(t)
+	store, _ := repository.New(db)
+	ctx := context.Background()
+	now := time.Date(2026, 7, 28, 6, 7, 8, 0, time.UTC)
+	userID := uuid(1400)
+	seedFreightUser(t, db, userID, now)
+	run := freightRun(1401, userID, now)
+	createAndStartFreightRun(t, store, run, "blocked-source-1", "3")
+	batch := freightBatch(1410, "a", "b")
+	batch.Orders[0].Items[0].SKU = ""
+	batch.Orders[0].Items[0].CanonicalSHA256 = repeatHex("7")
+	batch.Orders[0].CanonicalSHA256 = repeatHex("8")
+	if err := store.CompleteFreightSync(
+		ctx,
+		run,
+		batch,
+		now.Add(time.Second),
+	); err != nil {
+		t.Fatalf("CompleteFreightSync() error = %v", err)
+	}
+	orders, _ := store.ListFreightOrders(ctx, "local-admin", 10)
+	detail, _ := store.GetFreightOrder(ctx, "local-admin", orders[0].ID)
+	service, _ := usecase.NewProcurementService(
+		store,
+		procurementClock{now: now.Add(2 * time.Second)},
+		&procurementIDs{next: 1500},
+	)
+	blocked, err := service.CreateRequest(
+		ctx,
+		usecase.CreateProcurementRequestCommand{
+			CreatorSubject:           "local-admin",
+			ActorUserID:              userID,
+			FreightOrderItemID:       detail.Items[0].ID,
+			ConfirmProcurementNeeded: true,
+		},
+	)
+	if err != nil || blocked.Request.Status != domain.ProcurementBlocked ||
+		blocked.Request.BlockingCode == nil ||
+		*blocked.Request.BlockingCode != domain.ProcurementBlockSKURequired {
+		t.Fatalf("blocked request = %+v, %v", blocked, err)
+	}
+	_, err = service.CreateTask(
+		ctx,
+		usecase.CreateProcurementTaskCommand{
+			CreatorSubject: "local-admin",
+			ActorUserID:    userID,
+			RequestID:      blocked.Request.ID,
+			IdempotencyKey: "blocked-task",
+		},
+	)
+	var typed *usecase.Error
+	if !errors.As(err, &typed) ||
+		typed.Code != "PROCUREMENT_STATE_CONFLICT" {
+		t.Fatalf("blocked CreateTask() error = %v", err)
+	}
+}
+
+type procurementClock struct {
+	now time.Time
+}
+
+func (clock procurementClock) Now() time.Time {
+	return clock.now
+}
+
+type procurementIDs struct {
+	next int
+}
+
+func (ids *procurementIDs) NewID() (string, error) {
+	ids.next++
+	return uuid(ids.next), nil
+}
diff --git a/backend-api/internal/transport/httpapi/admin_handlers.go b/backend-api/internal/transport/httpapi/admin_handlers.go
index e24fe4d..1a3d00c 100644
--- a/backend-api/internal/transport/httpapi/admin_handlers.go
+++ b/backend-api/internal/transport/httpapi/admin_handlers.go
@@ -29,6 +29,7 @@ type AdminServices struct {
 	Results        *usecase.ExecutionResultService
 	Authorizations *usecase.OrderAuthorizationService
 	Freight        *usecase.FreightService
+	Procurement    *usecase.ProcurementService
 }
 
 func (s AdminServices) validate() error {
@@ -68,6 +69,20 @@ func registerAdminAPI(routes gin.IRoutes, services AdminServices) error {
 		routes.GET("/api/v1/freight-orders", handler.listFreightOrders)
 		routes.GET("/api/v1/freight-orders/:id", handler.freightOrderDetail)
 	}
+	if services.Procurement != nil {
+		routes.POST(
+			"/api/v1/freight-items/:id/procurement-request",
+			handler.createProcurementRequest,
+		)
+		routes.PUT(
+			"/api/v1/procurement-requests/:id/reference-asset",
+			handler.bindProcurementReference,
+		)
+		routes.POST(
+			"/api/v1/procurement-requests/:id/purchase-task",
+			handler.createProcurementTask,
+		)
+	}
 	return nil
 }
 
diff --git a/backend-api/internal/transport/httpapi/admin_handlers_test.go b/backend-api/internal/transport/httpapi/admin_handlers_test.go
index 443f484..723aa22 100644
--- a/backend-api/internal/transport/httpapi/admin_handlers_test.go
+++ b/backend-api/internal/transport/httpapi/admin_handlers_test.go
@@ -395,6 +395,199 @@ func TestAdminFreightAPIImportsAllItemsWithoutPII(t *testing.T) {
 	}
 }
 
+func TestAdminProcurementAPIProducesImmutablePendingTask(t *testing.T) {
+	fixture := newAdminIntegrationFixture(t)
+	createSync := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodPost,
+		"/api/v1/freight-syncs",
+		"application/json",
+		strings.NewReader(
+			`{"mode":"ORDER_NUMBER","order_number":"SOURCE-12"}`,
+		),
+		"procurement-freight-sync",
+	)
+	var syncBody struct {
+		Sync struct {
+			ID string `json:"id"`
+		} `json:"sync"`
+	}
+	decodeResponse(t, createSync, &syncBody)
+	succeeded := false
+	for attempt := 0; attempt < 50; attempt++ {
+		status := performAdminRequest(
+			t,
+			fixture.router,
+			http.MethodGet,
+			"/api/v1/freight-syncs/"+syncBody.Sync.ID,
+			"",
+			nil,
+			"",
+		)
+		if strings.Contains(status.Body.String(), `"status":"SUCCEEDED"`) {
+			succeeded = true
+			break
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+	if !succeeded {
+		t.Fatal("freight sync did not succeed")
+	}
+	orders := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodGet,
+		"/api/v1/freight-orders",
+		"",
+		nil,
+		"",
+	)
+	var orderBody struct {
+		Items []struct {
+			ID string `json:"id"`
+		} `json:"items"`
+	}
+	decodeResponse(t, orders, &orderBody)
+	detail := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodGet,
+		"/api/v1/freight-orders/"+orderBody.Items[0].ID,
+		"",
+		nil,
+		"",
+	)
+	var detailBody struct {
+		Items []struct {
+			ID string `json:"id"`
+		} `json:"items"`
+	}
+	decodeResponse(t, detail, &detailBody)
+	createRequest := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodPost,
+		"/api/v1/freight-items/"+detailBody.Items[0].ID+
+			"/procurement-request",
+		"application/json",
+		strings.NewReader(`{"confirm_procurement_needed":true}`),
+		"",
+	)
+	if createRequest.Code != http.StatusCreated ||
+		!strings.Contains(createRequest.Body.String(), `"status":"NEEDS_IMAGE"`) {
+		t.Fatalf(
+			"create request status/body = %d / %s",
+			createRequest.Code,
+			createRequest.Body,
+		)
+	}
+	var requestBody struct {
+		Request struct {
+			ID string `json:"id"`
+		} `json:"procurement_request"`
+	}
+	decodeResponse(t, createRequest, &requestBody)
+	imageBody, imageContentType := referenceUpload(t, "procurement-image")
+	upload := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodPost,
+		"/api/v1/assets",
+		imageContentType,
+		imageBody,
+		"procurement-image",
+	)
+	var assetBody struct {
+		ID string `json:"id"`
+	}
+	decodeResponse(t, upload, &assetBody)
+	bind := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodPut,
+		"/api/v1/procurement-requests/"+requestBody.Request.ID+
+			"/reference-asset",
+		"application/json",
+		strings.NewReader(
+			fmt.Sprintf(`{"image_asset_id":%q}`, assetBody.ID),
+		),
+		"",
+	)
+	if bind.Code != http.StatusOK ||
+		!strings.Contains(bind.Body.String(), `"status":"READY"`) {
+		t.Fatalf("bind status/body = %d / %s", bind.Code, bind.Body)
+	}
+	createTask := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodPost,
+		"/api/v1/procurement-requests/"+requestBody.Request.ID+
+			"/purchase-task",
+		"application/json",
+		strings.NewReader(`{}`),
+		"procurement-task-create",
+	)
+	if createTask.Code != http.StatusCreated ||
+		!strings.Contains(createTask.Body.String(), `"status":"PENDING"`) {
+		t.Fatalf(
+			"create task status/body = %d / %s",
+			createTask.Code,
+			createTask.Body,
+		)
+	}
+	var taskBody struct {
+		Task struct {
+			ID string `json:"id"`
+		} `json:"task"`
+	}
+	decodeResponse(t, createTask, &taskBody)
+	taskDetail := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodGet,
+		"/api/v1/tasks/"+taskBody.Task.ID,
+		"",
+		nil,
+		"",
+	)
+	for _, required := range []string{
+		`"title":"商品一"`,
+		`"sku":"BLACK-L"`,
+		`"quantity":1`,
+		`"image_asset_id":"` + assetBody.ID + `"`,
+		`"description":"ERP 规格：黑色,L"`,
+	} {
+		if !strings.Contains(taskDetail.Body.String(), required) {
+			t.Fatalf("task detail missing %q: %s", required, taskDetail.Body)
+		}
+	}
+	replay := performAdminRequest(
+		t,
+		fixture.router,
+		http.MethodPost,
+		"/api/v1/procurement-requests/"+requestBody.Request.ID+
+			"/purchase-task",
+		"application/json",
+		strings.NewReader(`{}`),
+		"procurement-task-replay",
+	)
+	if replay.Code != http.StatusCreated ||
+		!strings.Contains(replay.Body.String(), `"replayed":true`) ||
+		!strings.Contains(replay.Body.String(), taskBody.Task.ID) {
+		t.Fatalf("task replay status/body = %d / %s", replay.Code, replay.Body)
+	}
+	var sourceCount int
+	if err := fixture.db.QueryRow(
+		`SELECT count(*) FROM purchase_task_sources
+		WHERE task_id = ? AND procurement_request_id = ?`,
+		taskBody.Task.ID,
+		requestBody.Request.ID,
+	).Scan(&sourceCount); err != nil || sourceCount != 1 {
+		t.Fatalf("task source count = %d, error = %v", sourceCount, err)
+	}
+}
+
 func TestAdminOrderAuthorizationIsIdempotentAndRevisioned(t *testing.T) {
 	fixture := newAdminIntegrationFixture(t)
 	taskID, executionID, taskHash, firstKey, secondKey :=
@@ -515,6 +708,9 @@ func TestAdminOrderAuthorizationIsIdempotentAndRevisioned(t *testing.T) {
 	if err != nil {
 		t.Fatalf("migration.New() error = %v", err)
 	}
+	if err := runner.Down(context.Background()); err != nil {
+		t.Fatalf("procurement migration down: %v", err)
+	}
 	if err := runner.Down(context.Background()); err != nil {
 		t.Fatalf("freight migration down: %v", err)
 	}
@@ -852,6 +1048,14 @@ func newAdminIntegrationFixture(t *testing.T) *adminIntegrationFixture {
 	if err != nil {
 		t.Fatalf("usecase.NewFreightService() error = %v", err)
 	}
+	procurement, err := usecase.NewProcurementService(
+		repositories,
+		clock,
+		ids,
+	)
+	if err != nil {
+		t.Fatalf("usecase.NewProcurementService() error = %v", err)
+	}
 	registrar, err := NewAdminRouteRegistrar(
 		AdminServices{
 			Assets:         assets,
@@ -859,6 +1063,7 @@ func newAdminIntegrationFixture(t *testing.T) *adminIntegrationFixture {
 			Results:        results,
 			Authorizations: authorizations,
 			Freight:        freight,
+			Procurement:    procurement,
 		},
 		emptyAdminWeb{},
 	)
diff --git a/backend-api/internal/transport/httpapi/device_handlers_test.go b/backend-api/internal/transport/httpapi/device_handlers_test.go
index 69e9454..a26d336 100644
--- a/backend-api/internal/transport/httpapi/device_handlers_test.go
+++ b/backend-api/internal/transport/httpapi/device_handlers_test.go
@@ -713,6 +713,9 @@ func TestDeviceExecutionResultsAreIdempotentAndAuditable(t *testing.T) {
 	if err != nil {
 		t.Fatalf("migration.New() after review error = %v", err)
 	}
+	if err := runner.Down(context.Background()); err != nil {
+		t.Fatalf("procurement migration down: %v", err)
+	}
 	if err := runner.Down(context.Background()); err != nil {
 		t.Fatalf("freight migration down: %v", err)
 	}
@@ -730,8 +733,8 @@ func TestDeviceExecutionResultsAreIdempotentAndAuditable(t *testing.T) {
 	}
 	if applied, err := runner.Up(context.Background()); err != nil {
 		t.Fatalf("restore device command migration: %v", err)
-	} else if applied != 4 {
-		t.Fatalf("restored migrations = %d, want 4", applied)
+	} else if applied != 5 {
+		t.Fatalf("restored migrations = %d, want 5", applied)
 	}
 
 	completePayload := fmt.Sprintf(
@@ -1420,6 +1423,9 @@ func TestDeviceOrderCommandDeliveryAndAcknowledgementAreRecoverable(
 	if err != nil {
 		t.Fatalf("migration.New() error = %v", err)
 	}
+	if err := runner.Down(context.Background()); err != nil {
+		t.Fatalf("procurement migration down: %v", err)
+	}
 	if err := runner.Down(context.Background()); err != nil {
 		t.Fatalf("freight migration down: %v", err)
 	}
diff --git a/backend-api/internal/transport/httpapi/freight_handlers.go b/backend-api/internal/transport/httpapi/freight_handlers.go
index d0e3a8e..93972ef 100644
--- a/backend-api/internal/transport/httpapi/freight_handlers.go
+++ b/backend-api/internal/transport/httpapi/freight_handlers.go
@@ -147,10 +147,30 @@ func (h *adminHandlers) freightOrderDetail(ctx *gin.Context) {
 		})
 	}
 	ctx.Header("Cache-Control", "no-store")
-	ctx.JSON(http.StatusOK, gin.H{
+	response := gin.H{
 		"order": freightOrderResponse(detail.Order),
 		"items": items,
-	})
+	}
+	if h.services.Procurement != nil {
+		requests, requestErr := h.services.Procurement.ListForOrder(
+			ctx.Request.Context(),
+			localAdminSubject,
+			detail.Order.ID,
+		)
+		if requestErr != nil {
+			writeUsecaseError(ctx, requestErr)
+			return
+		}
+		requestItems := make([]gin.H, 0, len(requests))
+		for _, request := range requests {
+			requestItems = append(
+				requestItems,
+				procurementRequestResponse(request),
+			)
+		}
+		response["procurement_requests"] = requestItems
+	}
+	ctx.JSON(http.StatusOK, response)
 }
 
 func freightSyncResponse(run domain.FreightSyncRun) gin.H {
diff --git a/backend-api/internal/transport/httpapi/procurement_handlers.go b/backend-api/internal/transport/httpapi/procurement_handlers.go
new file mode 100644
index 0000000..6feed3c
--- /dev/null
+++ b/backend-api/internal/transport/httpapi/procurement_handlers.go
@@ -0,0 +1,168 @@
+package httpapi
+
+import (
+	"net/http"
+
+	"cmroubao/backend-api/internal/domain"
+	"cmroubao/backend-api/internal/usecase"
+
+	"github.com/gin-gonic/gin"
+)
+
+func (h *adminHandlers) createProcurementRequest(ctx *gin.Context) {
+	if !hasMediaType(ctx, "application/json") {
+		writePublicError(
+			ctx,
+			http.StatusUnsupportedMediaType,
+			"UNSUPPORTED_MEDIA_TYPE",
+			"application/json is required",
+			false,
+			gin.H{},
+		)
+		return
+	}
+	var request struct {
+		ConfirmProcurementNeeded bool `json:"confirm_procurement_needed"`
+	}
+	if err := decodeJSON(ctx, &request); err != nil {
+		writePublicError(
+			ctx,
+			http.StatusBadRequest,
+			"INVALID_JSON",
+			"request body must be valid JSON",
+			false,
+			gin.H{},
+		)
+		return
+	}
+	result, err := h.services.Procurement.CreateRequest(
+		ctx.Request.Context(),
+		usecase.CreateProcurementRequestCommand{
+			CreatorSubject:           localAdminSubject,
+			ActorUserID:              adminActorUserID(ctx),
+			FreightOrderItemID:       ctx.Param("id"),
+			ConfirmProcurementNeeded: request.ConfirmProcurementNeeded,
+		},
+	)
+	if err != nil {
+		writeUsecaseError(ctx, err)
+		return
+	}
+	ctx.Header("Cache-Control", "no-store")
+	ctx.JSON(http.StatusCreated, gin.H{
+		"procurement_request": procurementRequestResponse(result.Request),
+		"replayed":            result.Replayed,
+	})
+}
+
+func (h *adminHandlers) bindProcurementReference(ctx *gin.Context) {
+	if !hasMediaType(ctx, "application/json") {
+		writePublicError(
+			ctx,
+			http.StatusUnsupportedMediaType,
+			"UNSUPPORTED_MEDIA_TYPE",
+			"application/json is required",
+			false,
+			gin.H{},
+		)
+		return
+	}
+	var request struct {
+		ImageAssetID string `json:"image_asset_id"`
+	}
+	if err := decodeJSON(ctx, &request); err != nil {
+		writePublicError(
+			ctx,
+			http.StatusBadRequest,
+			"INVALID_JSON",
+			"request body must be valid JSON",
+			false,
+			gin.H{},
+		)
+		return
+	}
+	result, err := h.services.Procurement.BindReference(
+		ctx.Request.Context(),
+		usecase.BindProcurementReferenceCommand{
+			CreatorSubject: localAdminSubject,
+			ActorUserID:    adminActorUserID(ctx),
+			RequestID:      ctx.Param("id"),
+			ImageAssetID:   request.ImageAssetID,
+		},
+	)
+	if err != nil {
+		writeUsecaseError(ctx, err)
+		return
+	}
+	ctx.Header("Cache-Control", "no-store")
+	ctx.JSON(http.StatusOK, gin.H{
+		"procurement_request": procurementRequestResponse(result),
+	})
+}
+
+func (h *adminHandlers) createProcurementTask(ctx *gin.Context) {
+	if !hasMediaType(ctx, "application/json") {
+		writePublicError(
+			ctx,
+			http.StatusUnsupportedMediaType,
+			"UNSUPPORTED_MEDIA_TYPE",
+			"application/json is required",
+			false,
+			gin.H{},
+		)
+		return
+	}
+	var request struct{}
+	if err := decodeJSON(ctx, &request); err != nil {
+		writePublicError(
+			ctx,
+			http.StatusBadRequest,
+			"INVALID_JSON",
+			"request body must be an empty JSON object",
+			false,
+			gin.H{},
+		)
+		return
+	}
+	result, err := h.services.Procurement.CreateTask(
+		ctx.Request.Context(),
+		usecase.CreateProcurementTaskCommand{
+			CreatorSubject: localAdminSubject,
+			ActorUserID:    adminActorUserID(ctx),
+			RequestID:      ctx.Param("id"),
+			IdempotencyKey: ctx.GetHeader("Idempotency-Key"),
+		},
+	)
+	if err != nil {
+		writeUsecaseError(ctx, err)
+		return
+	}
+	ctx.Header("Cache-Control", "no-store")
+	ctx.JSON(http.StatusCreated, gin.H{
+		"task":     taskSummaryResponse(result.Task),
+		"replayed": result.Replayed,
+	})
+}
+
+func procurementRequestResponse(
+	request domain.ProcurementRequest,
+) gin.H {
+	return gin.H{
+		"id":                     request.ID,
+		"freight_order_item_id":  request.FreightOrderItemID,
+		"source_revision":        request.SourceRevision,
+		"source_sha256":          request.SourceSHA256,
+		"title":                  request.Title,
+		"product_spec":           request.ProductSpec,
+		"sku":                    request.SKU,
+		"quantity":               request.Quantity,
+		"source_purchase_status": request.SourcePurchaseStatus,
+		"status":                 request.Status,
+		"blocking_code":          request.BlockingCode,
+		"reference_asset_id":     request.ReferenceAssetID,
+		"purchase_task_id":       request.PurchaseTaskID,
+		"source_changed":         request.SourceChanged,
+		"created_at":             formatTime(request.CreatedAt),
+		"updated_at":             formatTime(request.UpdatedAt),
+	}
+}
diff --git a/backend-api/internal/transport/webui/handler.go b/backend-api/internal/transport/webui/handler.go
index e3c6c3c..f38e2a4 100644
--- a/backend-api/internal/transport/webui/handler.go
+++ b/backend-api/internal/transport/webui/handler.go
@@ -77,6 +77,23 @@ func (h *Handler) RegisterProtected(routes gin.IRoutes) {
 		routes.POST("/freight/import", SecurityHeaders(), h.CreateFreightImport)
 		routes.GET("/freight/:id", SecurityHeaders(), h.FreightDetail)
 	}
+	if _, ok := h.service.(ProcurementService); ok {
+		routes.POST(
+			"/freight/items/:id/procurement-request",
+			SecurityHeaders(),
+			h.CreateFreightProcurementRequest,
+		)
+		routes.POST(
+			"/freight/procurement-requests/:id/reference",
+			SecurityHeaders(),
+			h.BindFreightProcurementReference,
+		)
+		routes.POST(
+			"/freight/procurement-requests/:id/purchase-task",
+			SecurityHeaders(),
+			h.CreateFreightProcurementTask,
+		)
+	}
 }
 
 func (h *Handler) ListFreight(ctx *gin.Context) {
@@ -193,6 +210,23 @@ func (h *Handler) FreightDetail(ctx *gin.Context) {
 		return
 	}
 	token, _ := csrfToken(ctx)
+	for index := range detail.Items {
+		if detail.Items[index].Request == nil {
+			continue
+		}
+		uploadKey, keyErr := newToken()
+		if keyErr != nil {
+			h.renderError(ctx, http.StatusInternalServerError, "页面暂时无法打开", "请稍后重试。")
+			return
+		}
+		taskKey, keyErr := newToken()
+		if keyErr != nil {
+			h.renderError(ctx, http.StatusInternalServerError, "页面暂时无法打开", "请稍后重试。")
+			return
+		}
+		detail.Items[index].Request.UploadKey = uploadKey
+		detail.Items[index].Request.TaskKey = taskKey
+	}
 	h.render(ctx, http.StatusOK, "freight-detail", freightDetailPage{
 		Page: pageView{
 			Title:          "货运详情",
@@ -200,9 +234,148 @@ func (h *Handler) FreightDetail(ctx *gin.Context) {
 			CSRFToken:      token,
 		},
 		Detail: detail,
+		Notice: freightNotice(ctx.Query("notice")),
 	})
 }
 
+func (h *Handler) CreateFreightProcurementRequest(ctx *gin.Context) {
+	ctx.Request.Body = http.MaxBytesReader(ctx.Writer, ctx.Request.Body, 16<<10)
+	if err := ctx.Request.ParseForm(); err != nil || !validCSRF(ctx) {
+		h.renderError(ctx, http.StatusForbidden, "请求已失效", "请返回货运详情后重新操作。")
+		return
+	}
+	orderID := strings.TrimSpace(ctx.PostForm("order_id"))
+	if pathEscape(orderID) == "invalid" ||
+		ctx.PostForm("confirm_procurement_needed") != "1" {
+		h.renderError(ctx, http.StatusUnprocessableEntity, "必须人工确认", "请核对来源商品后确认仍需采购。")
+		return
+	}
+	service := h.service.(ProcurementService)
+	_, err := service.CreateProcurementRequest(
+		ctx.Request.Context(),
+		CreateProcurementRequestInput{
+			ActorUserID:              actorUserID(ctx.Request.Context()),
+			FreightOrderItemID:       strings.TrimSpace(ctx.Param("id")),
+			ConfirmProcurementNeeded: true,
+		},
+	)
+	if err != nil {
+		if errors.Is(err, ErrConflict) || errors.Is(err, ErrValidation) {
+			ctx.Redirect(
+				http.StatusSeeOther,
+				"/freight/"+pathEscape(orderID)+"?notice=request-conflict",
+			)
+			return
+		}
+		h.renderServiceError(ctx, err, "采购需求创建失败，请稍后重试。")
+		return
+	}
+	ctx.Redirect(
+		http.StatusSeeOther,
+		"/freight/"+pathEscape(orderID)+"?notice=request-created",
+	)
+}
+
+func (h *Handler) BindFreightProcurementReference(ctx *gin.Context) {
+	ctx.Request.Body = http.MaxBytesReader(
+		ctx.Writer,
+		ctx.Request.Body,
+		maxRequestBytes,
+	)
+	if err := ctx.Request.ParseMultipartForm(maxRequestBytes); err != nil ||
+		!validCSRF(ctx) {
+		h.renderError(ctx, http.StatusForbidden, "请求已失效", "请返回货运详情后重新操作。")
+		return
+	}
+	if ctx.Request.MultipartForm != nil {
+		defer ctx.Request.MultipartForm.RemoveAll()
+	}
+	orderID := strings.TrimSpace(ctx.PostForm("order_id"))
+	uploadKey := strings.TrimSpace(ctx.PostForm("upload_key"))
+	if pathEscape(orderID) == "invalid" || !validToken(uploadKey) {
+		h.renderError(ctx, http.StatusForbidden, "请求已失效", "请返回货运详情后重新操作。")
+		return
+	}
+	asset, err := h.uploadReference(ctx, uploadKey)
+	if err != nil {
+		ctx.Redirect(
+			http.StatusSeeOther,
+			"/freight/"+pathEscape(orderID)+"?notice=image-invalid",
+		)
+		return
+	}
+	service := h.service.(ProcurementService)
+	_, err = service.BindProcurementReference(
+		ctx.Request.Context(),
+		BindProcurementReferenceInput{
+			ActorUserID:  actorUserID(ctx.Request.Context()),
+			RequestID:    strings.TrimSpace(ctx.Param("id")),
+			ImageAssetID: asset.ID,
+		},
+	)
+	if err != nil {
+		ctx.Redirect(
+			http.StatusSeeOther,
+			"/freight/"+pathEscape(orderID)+"?notice=reference-conflict",
+		)
+		return
+	}
+	ctx.Redirect(
+		http.StatusSeeOther,
+		"/freight/"+pathEscape(orderID)+"?notice=reference-bound",
+	)
+}
+
+func (h *Handler) CreateFreightProcurementTask(ctx *gin.Context) {
+	ctx.Request.Body = http.MaxBytesReader(ctx.Writer, ctx.Request.Body, 16<<10)
+	if err := ctx.Request.ParseForm(); err != nil || !validCSRF(ctx) {
+		h.renderError(ctx, http.StatusForbidden, "请求已失效", "请返回货运详情后重新操作。")
+		return
+	}
+	orderID := strings.TrimSpace(ctx.PostForm("order_id"))
+	taskKey := strings.TrimSpace(ctx.PostForm("task_key"))
+	if pathEscape(orderID) == "invalid" || !validToken(taskKey) {
+		h.renderError(ctx, http.StatusForbidden, "请求已失效", "请返回货运详情后重新操作。")
+		return
+	}
+	service := h.service.(ProcurementService)
+	task, err := service.CreateProcurementTask(
+		ctx.Request.Context(),
+		CreateProcurementTaskInput{
+			ActorUserID:    actorUserID(ctx.Request.Context()),
+			RequestID:      strings.TrimSpace(ctx.Param("id")),
+			IdempotencyKey: taskKey,
+		},
+	)
+	if err != nil {
+		ctx.Redirect(
+			http.StatusSeeOther,
+			"/freight/"+pathEscape(orderID)+"?notice=task-conflict",
+		)
+		return
+	}
+	ctx.Redirect(http.StatusSeeOther, "/tasks/"+pathEscape(task.ID))
+}
+
+func freightNotice(value string) string {
+	switch value {
+	case "request-created":
+		return "采购需求已创建，请补充参考图。"
+	case "request-conflict":
+		return "来源已变化或当前商品不能创建采购需求。"
+	case "image-invalid":
+		return "参考图片无效，请选择 JPG、PNG 或 WebP 后重试。"
+	case "reference-conflict":
+		return "参考图已被使用或来源已变化，请刷新后重试。"
+	case "reference-bound":
+		return "参考图已绑定，可以生成采购任务。"
+	case "task-conflict":
+		return "需求状态或来源已变化，当前不能生成任务。"
+	default:
+		return ""
+	}
+}
+
 func SecurityHeaders() gin.HandlerFunc {
 	return func(ctx *gin.Context) {
 		ctx.Header(
@@ -892,6 +1065,7 @@ type freightImportPage struct {
 type freightDetailPage struct {
 	Page   pageView
 	Detail FreightOrderDetail
+	Notice string
 }
 
 type statusOption struct {
diff --git a/backend-api/internal/transport/webui/handler_test.go b/backend-api/internal/transport/webui/handler_test.go
index f86a549..90957f1 100644
--- a/backend-api/internal/transport/webui/handler_test.go
+++ b/backend-api/internal/transport/webui/handler_test.go
@@ -994,6 +994,83 @@ func TestFreightPagesEscapeSourceDataAndCreateAsyncSync(t *testing.T) {
 	}
 }
 
+func TestFreightDetailCreatesProcurementTaskWithCSRF(t *testing.T) {
+	const itemID = "00000000-0000-4000-8000-000000000002"
+	service := &fakeProcurementService{
+		fakeFreightService: &fakeFreightService{
+			fakeService: &fakeService{},
+			orderDetail: FreightOrderDetail{
+				Order: FreightOrder{
+					ID:              testTaskID,
+					ExternalStockID: "12",
+					SourceCode:      "SOURCE-12",
+				},
+				Items: []FreightItemReview{{
+					Item: FreightOrderItem{
+						ID:             itemID,
+						ExternalItemID: "88",
+						Title:          "商品",
+						SKU:            "BLACK-L",
+						Quantity:       2,
+					},
+					Request: &ProcurementRequest{
+						ID:                 itemID,
+						FreightOrderItemID: itemID,
+						Status:             "READY",
+						StatusLabel:        "可以生成任务",
+					},
+				}},
+			},
+		},
+		createTaskResult: Task{
+			ID:     testTaskID,
+			Status: "PENDING",
+		},
+	}
+	router := newTestRouter(t, service)
+	detail := performRequest(
+		t,
+		router,
+		http.MethodGet,
+		"/freight/"+testTaskID,
+		nil,
+		"",
+	)
+	if detail.Code != http.StatusOK ||
+		!strings.Contains(detail.Body.String(), "生成采购任务") ||
+		!strings.Contains(detail.Body.String(), "可以生成任务") {
+		t.Fatalf("detail status/body = %d / %s", detail.Code, detail.Body)
+	}
+	cookie := csrfCookie(t, detail)
+	taskKey := hiddenValue(t, detail.Body.String(), "task_key")
+	values := url.Values{
+		"csrf_token": {cookie.Value},
+		"order_id":   {testTaskID},
+		"task_key":   {taskKey},
+	}
+	request := httptest.NewRequest(
+		http.MethodPost,
+		"/freight/procurement-requests/"+itemID+"/purchase-task",
+		strings.NewReader(values.Encode()),
+	)
+	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	request.AddCookie(cookie)
+	response := httptest.NewRecorder()
+	router.ServeHTTP(response, request)
+	if response.Code != http.StatusSeeOther ||
+		response.Header().Get("Location") != "/tasks/"+testTaskID {
+		t.Fatalf(
+			"create task status/location = %d / %q",
+			response.Code,
+			response.Header().Get("Location"),
+		)
+	}
+	if service.createTaskInput.RequestID != itemID ||
+		service.createTaskInput.IdempotencyKey != taskKey {
+		t.Fatalf("create task input = %+v", service.createTaskInput)
+	}
+}
+
 type fakeService struct {
 	listInput       ListTasksInput
 	listResult      TaskList
@@ -1027,6 +1104,40 @@ type fakeFreightService struct {
 	err          error
 }
 
+type fakeProcurementService struct {
+	*fakeFreightService
+	createRequestInput CreateProcurementRequestInput
+	bindInput          BindProcurementReferenceInput
+	createTaskInput    CreateProcurementTaskInput
+	procurementResult  ProcurementRequest
+	createTaskResult   Task
+	procurementError   error
+}
+
+func (service *fakeProcurementService) CreateProcurementRequest(
+	_ context.Context,
+	input CreateProcurementRequestInput,
+) (ProcurementRequest, error) {
+	service.createRequestInput = input
+	return service.procurementResult, service.procurementError
+}
+
+func (service *fakeProcurementService) BindProcurementReference(
+	_ context.Context,
+	input BindProcurementReferenceInput,
+) (ProcurementRequest, error) {
+	service.bindInput = input
+	return service.procurementResult, service.procurementError
+}
+
+func (service *fakeProcurementService) CreateProcurementTask(
+	_ context.Context,
+	input CreateProcurementTaskInput,
+) (Task, error) {
+	service.createTaskInput = input
+	return service.createTaskResult, service.procurementError
+}
+
 func (service *fakeFreightService) ListFreightOrders(
 	context.Context,
 	int,
diff --git a/backend-api/internal/transport/webui/static/admin.css b/backend-api/internal/transport/webui/static/admin.css
index dc78496..4ec1d8b 100644
--- a/backend-api/internal/transport/webui/static/admin.css
+++ b/backend-api/internal/transport/webui/static/admin.css
@@ -721,6 +721,35 @@ tbody tr:last-child td {
   font-weight: 700;
 }
 
+.procurement-actions {
+  min-width: 220px;
+}
+
+.procurement-actions form {
+  display: grid;
+  gap: 9px;
+  margin-top: 8px;
+}
+
+.procurement-actions input[type="file"] {
+  min-width: 0;
+  font-size: 12px;
+}
+
+.confirm-line {
+  display: flex;
+  align-items: flex-start;
+  gap: 8px;
+  font-size: 13px;
+}
+
+.confirm-line input {
+  width: 20px;
+  min-height: 20px;
+  flex: 0 0 auto;
+  margin-top: 1px;
+}
+
 .task-form {
   display: grid;
   gap: 18px;
diff --git a/backend-api/internal/transport/webui/templates/freight-detail.gohtml b/backend-api/internal/transport/webui/templates/freight-detail.gohtml
index 4de258d..fe6dd0c 100644
--- a/backend-api/internal/transport/webui/templates/freight-detail.gohtml
+++ b/backend-api/internal/transport/webui/templates/freight-detail.gohtml
@@ -15,6 +15,7 @@
       </div>
       <a class="button" href="/freight">返回列表</a>
     </div>
+    {{if .Notice}}<div class="notice" role="status">{{.Notice}}</div>{{end}}
     <section class="detail-section" aria-labelledby="freight-source-title">
       <h2 id="freight-source-title">来源信息</h2>
       <dl class="detail-grid">
@@ -35,23 +36,73 @@
             <th scope="col">数量</th>
             <th scope="col">采购状态</th>
             <th scope="col">来源版本</th>
+            <th scope="col">采购处理</th>
           </tr>
         </thead>
         <tbody>
           {{range .Detail.Items}}
           <tr>
             <td data-label="商品">
-              <strong>{{if .Title}}{{.Title}}{{else}}缺少标题{{end}}</strong>
-              <span class="secondary">明细 ID：{{.ExternalItemID}}</span>
-              {{if .ProductThumbRef}}<span class="secondary">图片引用：{{.ProductThumbRef}}</span>{{end}}
+              <strong>{{if .Item.Title}}{{.Item.Title}}{{else}}缺少标题{{end}}</strong>
+              <span class="secondary">明细 ID：{{.Item.ExternalItemID}}</span>
+              {{if .Item.ProductThumbRef}}<span class="secondary">图片引用：{{.Item.ProductThumbRef}}</span>{{end}}
             </td>
             <td data-label="规格 / SKU">
-              <span>{{if .ProductSpec}}{{.ProductSpec}}{{else}}未提供规格{{end}}</span>
-              <span class="secondary">SKU：{{if .SKU}}{{.SKU}}{{else}}未提供{{end}}</span>
+              <span>{{if .Item.ProductSpec}}{{.Item.ProductSpec}}{{else}}未提供规格{{end}}</span>
+              <span class="secondary">SKU：{{if .Item.SKU}}{{.Item.SKU}}{{else}}未提供{{end}}</span>
+            </td>
+            <td data-label="数量">{{if .Item.Quantity}}{{.Item.Quantity}}{{else}}未提供{{end}}</td>
+            <td data-label="采购状态">{{if .Item.PurchaseStatus}}{{.Item.PurchaseStatus}}{{else}}未提供{{end}}</td>
+            <td data-label="来源版本">{{.Item.Revision}}</td>
+            <td data-label="采购处理" class="procurement-actions">
+              {{if .Request}}
+              <strong>{{.Request.StatusLabel}}</strong>
+              {{if .Request.BlockingLabel}}<span class="secondary">{{.Request.BlockingLabel}}</span>{{end}}
+              {{if .Request.SourceChanged}}
+              <form method="post" action="/freight/items/{{pathPart .Item.ID}}/procurement-request">
+                <input type="hidden" name="csrf_token" value="{{$.Page.CSRFToken}}">
+                <input type="hidden" name="order_id" value="{{$.Detail.Order.ID}}">
+                <label class="confirm-line">
+                  <input type="checkbox" name="confirm_procurement_needed" value="1" required>
+                  <span>已核对当前版本仍需采购</span>
+                </label>
+                <button class="button" type="submit">创建当前版本需求</button>
+              </form>
+              {{else if eq .Request.Status "NEEDS_IMAGE"}}
+              <form method="post" enctype="multipart/form-data"
+                action="/freight/procurement-requests/{{pathPart .Request.ID}}/reference">
+                <input type="hidden" name="csrf_token" value="{{$.Page.CSRFToken}}">
+                <input type="hidden" name="order_id" value="{{$.Detail.Order.ID}}">
+                <input type="hidden" name="upload_key" value="{{.Request.UploadKey}}">
+                <label>
+                  <span class="visually-hidden">参考图片</span>
+                  <input name="image" type="file" accept="image/jpeg,image/png,image/webp" required>
+                </label>
+                <button class="button" type="submit">上传参考图</button>
+              </form>
+              {{else if eq .Request.Status "READY"}}
+              <form method="post"
+                action="/freight/procurement-requests/{{pathPart .Request.ID}}/purchase-task">
+                <input type="hidden" name="csrf_token" value="{{$.Page.CSRFToken}}">
+                <input type="hidden" name="order_id" value="{{$.Detail.Order.ID}}">
+                <input type="hidden" name="task_key" value="{{.Request.TaskKey}}">
+                <button class="button primary" type="submit">生成采购任务</button>
+              </form>
+              {{else if .Request.PurchaseTaskID}}
+              <a class="detail-link" href="/tasks/{{pathPart .Request.PurchaseTaskID}}">查看采购任务</a>
+              {{end}}
+              {{else}}
+              <form method="post" action="/freight/items/{{pathPart .Item.ID}}/procurement-request">
+                <input type="hidden" name="csrf_token" value="{{$.Page.CSRFToken}}">
+                <input type="hidden" name="order_id" value="{{$.Detail.Order.ID}}">
+                <label class="confirm-line">
+                  <input type="checkbox" name="confirm_procurement_needed" value="1" required>
+                  <span>已核对该商品仍需采购</span>
+                </label>
+                <button class="button" type="submit">创建采购需求</button>
+              </form>
+              {{end}}
             </td>
-            <td data-label="数量">{{if .Quantity}}{{.Quantity}}{{else}}未提供{{end}}</td>
-            <td data-label="采购状态">{{if .PurchaseStatus}}{{.PurchaseStatus}}{{else}}未提供{{end}}</td>
-            <td data-label="来源版本">{{.Revision}}</td>
           </tr>
           {{end}}
         </tbody>
diff --git a/backend-api/internal/transport/webui/types.go b/backend-api/internal/transport/webui/types.go
index f6c90cd..f64f16a 100644
--- a/backend-api/internal/transport/webui/types.go
+++ b/backend-api/internal/transport/webui/types.go
@@ -37,6 +37,39 @@ type FreightService interface {
 	) (FreightSync, error)
 }
 
+type ProcurementService interface {
+	CreateProcurementRequest(
+		context.Context,
+		CreateProcurementRequestInput,
+	) (ProcurementRequest, error)
+	BindProcurementReference(
+		context.Context,
+		BindProcurementReferenceInput,
+	) (ProcurementRequest, error)
+	CreateProcurementTask(
+		context.Context,
+		CreateProcurementTaskInput,
+	) (Task, error)
+}
+
+type CreateProcurementRequestInput struct {
+	ActorUserID              string
+	FreightOrderItemID       string
+	ConfirmProcurementNeeded bool
+}
+
+type BindProcurementReferenceInput struct {
+	ActorUserID  string
+	RequestID    string
+	ImageAssetID string
+}
+
+type CreateProcurementTaskInput struct {
+	ActorUserID    string
+	RequestID      string
+	IdempotencyKey string
+}
+
 type FreightSync struct {
 	ID         string
 	Status     string
@@ -81,7 +114,27 @@ type FreightOrderItem struct {
 
 type FreightOrderDetail struct {
 	Order FreightOrder
-	Items []FreightOrderItem
+	Items []FreightItemReview
+}
+
+type FreightItemReview struct {
+	Item    FreightOrderItem
+	Request *ProcurementRequest
+}
+
+type ProcurementRequest struct {
+	ID                 string
+	FreightOrderItemID string
+	SourceRevision     int
+	Status             string
+	StatusLabel        string
+	BlockingCode       string
+	BlockingLabel      string
+	ReferenceAssetID   string
+	PurchaseTaskID     string
+	SourceChanged      bool
+	UploadKey          string
+	TaskKey            string
 }
 
 type ListTasksInput struct {
diff --git a/backend-api/internal/transport/webui/usecase_adapter.go b/backend-api/internal/transport/webui/usecase_adapter.go
index d257643..0c404ed 100644
--- a/backend-api/internal/transport/webui/usecase_adapter.go
+++ b/backend-api/internal/transport/webui/usecase_adapter.go
@@ -18,6 +18,13 @@ type UsecaseAdapter struct {
 	assets         *usecase.AssetService
 	authorizations *usecase.OrderAuthorizationService
 	freight        *usecase.FreightService
+	procurement    *usecase.ProcurementService
+}
+
+func (adapter *UsecaseAdapter) SetProcurement(
+	procurement *usecase.ProcurementService,
+) {
+	adapter.procurement = procurement
 }
 
 func NewUsecaseAdapter(
@@ -73,7 +80,23 @@ func (adapter *UsecaseAdapter) GetFreightOrder(
 	if err != nil {
 		return FreightOrderDetail{}, mapUsecaseError(err)
 	}
-	items := make([]FreightOrderItem, 0, len(detail.Items))
+	requestByItem := map[string]domain.ProcurementRequest{}
+	if adapter.procurement != nil {
+		requests, requestErr := adapter.procurement.ListForOrder(
+			ctx,
+			localAdminSubject,
+			detail.Order.ID,
+		)
+		if requestErr != nil {
+			return FreightOrderDetail{}, mapUsecaseError(requestErr)
+		}
+		for _, request := range requests {
+			if _, exists := requestByItem[request.FreightOrderItemID]; !exists {
+				requestByItem[request.FreightOrderItemID] = request
+			}
+		}
+	}
+	items := make([]FreightItemReview, 0, len(detail.Items))
 	for _, item := range detail.Items {
 		view := FreightOrderItem{
 			ID:              item.ID,
@@ -88,7 +111,12 @@ func (adapter *UsecaseAdapter) GetFreightOrder(
 		if item.Quantity != nil {
 			view.Quantity = *item.Quantity
 		}
-		items = append(items, view)
+		review := FreightItemReview{Item: view}
+		if request, exists := requestByItem[item.ID]; exists {
+			requestView := procurementRequestFrom(request)
+			review.Request = &requestView
+		}
+		items = append(items, review)
 	}
 	return FreightOrderDetail{
 		Order: freightOrderFrom(detail.Order),
@@ -96,6 +124,131 @@ func (adapter *UsecaseAdapter) GetFreightOrder(
 	}, nil
 }
 
+func (adapter *UsecaseAdapter) CreateProcurementRequest(
+	ctx context.Context,
+	input CreateProcurementRequestInput,
+) (ProcurementRequest, error) {
+	if adapter.procurement == nil {
+		return ProcurementRequest{}, ErrUnavailable
+	}
+	result, err := adapter.procurement.CreateRequest(
+		ctx,
+		usecase.CreateProcurementRequestCommand{
+			CreatorSubject:           localAdminSubject,
+			ActorUserID:              input.ActorUserID,
+			FreightOrderItemID:       input.FreightOrderItemID,
+			ConfirmProcurementNeeded: input.ConfirmProcurementNeeded,
+		},
+	)
+	if err != nil {
+		return ProcurementRequest{}, mapUsecaseError(err)
+	}
+	return procurementRequestFrom(result.Request), nil
+}
+
+func (adapter *UsecaseAdapter) BindProcurementReference(
+	ctx context.Context,
+	input BindProcurementReferenceInput,
+) (ProcurementRequest, error) {
+	if adapter.procurement == nil {
+		return ProcurementRequest{}, ErrUnavailable
+	}
+	request, err := adapter.procurement.BindReference(
+		ctx,
+		usecase.BindProcurementReferenceCommand{
+			CreatorSubject: localAdminSubject,
+			ActorUserID:    input.ActorUserID,
+			RequestID:      input.RequestID,
+			ImageAssetID:   input.ImageAssetID,
+		},
+	)
+	if err != nil {
+		return ProcurementRequest{}, mapUsecaseError(err)
+	}
+	return procurementRequestFrom(request), nil
+}
+
+func (adapter *UsecaseAdapter) CreateProcurementTask(
+	ctx context.Context,
+	input CreateProcurementTaskInput,
+) (Task, error) {
+	if adapter.procurement == nil {
+		return Task{}, ErrUnavailable
+	}
+	result, err := adapter.procurement.CreateTask(
+		ctx,
+		usecase.CreateProcurementTaskCommand{
+			CreatorSubject: localAdminSubject,
+			ActorUserID:    input.ActorUserID,
+			RequestID:      input.RequestID,
+			IdempotencyKey: input.IdempotencyKey,
+		},
+	)
+	if err != nil {
+		return Task{}, mapUsecaseError(err)
+	}
+	return taskFromPurchase(result.Task), nil
+}
+
+func procurementRequestFrom(
+	request domain.ProcurementRequest,
+) ProcurementRequest {
+	result := ProcurementRequest{
+		ID:                 request.ID,
+		FreightOrderItemID: request.FreightOrderItemID,
+		SourceRevision:     request.SourceRevision,
+		Status:             string(request.Status),
+		StatusLabel:        procurementStatusLabel(request.Status),
+		BlockingCode:       stringValue(request.BlockingCode),
+		BlockingLabel: procurementBlockingLabel(
+			stringValue(request.BlockingCode),
+		),
+		ReferenceAssetID: stringValue(request.ReferenceAssetID),
+		PurchaseTaskID:   stringValue(request.PurchaseTaskID),
+		SourceChanged:    request.SourceChanged,
+	}
+	if request.SourceChanged {
+		result.StatusLabel = "来源已变化"
+	}
+	return result
+}
+
+func procurementStatusLabel(
+	status domain.ProcurementRequestStatus,
+) string {
+	switch status {
+	case domain.ProcurementBlocked:
+		return "资料阻塞"
+	case domain.ProcurementNeedsImage:
+		return "需要参考图"
+	case domain.ProcurementReady:
+		return "可以生成任务"
+	case domain.ProcurementTaskCreated:
+		return "任务已生成"
+	case domain.ProcurementSourceChanged:
+		return "来源已变化"
+	default:
+		return "未知状态"
+	}
+}
+
+func procurementBlockingLabel(code string) string {
+	switch code {
+	case domain.ProcurementBlockSourceCanceled:
+		return "货运单已取消"
+	case domain.ProcurementBlockTitleRequired:
+		return "商品标题缺失或超限"
+	case domain.ProcurementBlockSKURequired:
+		return "SKU 缺失或超限"
+	case domain.ProcurementBlockQuantityRequired:
+		return "数量缺失或无效"
+	case domain.ProcurementBlockSourceChanged:
+		return "ERP 来源已更新"
+	default:
+		return ""
+	}
+}
+
 func (adapter *UsecaseAdapter) GetFreightSync(
 	ctx context.Context,
 	syncID string,
@@ -660,3 +813,4 @@ func (err *adapterError) Unwrap() []error {
 
 var _ Service = (*UsecaseAdapter)(nil)
 var _ FreightService = (*UsecaseAdapter)(nil)
+var _ ProcurementService = (*UsecaseAdapter)(nil)
diff --git a/backend-api/internal/usecase/procurement_ports.go b/backend-api/internal/usecase/procurement_ports.go
new file mode 100644
index 0000000..edc257f
--- /dev/null
+++ b/backend-api/internal/usecase/procurement_ports.go
@@ -0,0 +1,46 @@
+package usecase
+
+import (
+	"context"
+	"time"
+
+	"cmroubao/backend-api/internal/domain"
+)
+
+type ProcurementRepository interface {
+	GetProcurementSourceItem(
+		context.Context,
+		string,
+		string,
+	) (domain.ProcurementSourceItem, error)
+	CreateProcurementRequest(
+		context.Context,
+		domain.ProcurementRequest,
+	) (domain.ProcurementRequest, bool, error)
+	ListProcurementRequestsForOrder(
+		context.Context,
+		string,
+		string,
+	) ([]domain.ProcurementRequest, error)
+	GetProcurementRequest(
+		context.Context,
+		string,
+		string,
+	) (domain.ProcurementRequest, error)
+	BindProcurementReference(
+		context.Context,
+		string,
+		string,
+		string,
+		time.Time,
+	) (domain.ProcurementRequest, error)
+	CreateProcurementTask(
+		context.Context,
+		domain.ProcurementRequest,
+		domain.PurchaseTask,
+		domain.TaskEvent,
+		domain.PurchaseTaskSource,
+		string,
+		string,
+	) (domain.PurchaseTask, bool, error)
+}
diff --git a/backend-api/internal/usecase/procurement_service.go b/backend-api/internal/usecase/procurement_service.go
new file mode 100644
index 0000000..ad0c215
--- /dev/null
+++ b/backend-api/internal/usecase/procurement_service.go
@@ -0,0 +1,412 @@
+package usecase
+
+import (
+	"context"
+	"errors"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+
+	"cmroubao/backend-api/internal/domain"
+)
+
+var (
+	ErrProcurementStateConflict = errors.New(
+		"procurement request state conflict",
+	)
+	ErrProcurementSourceChanged = errors.New(
+		"procurement request source changed",
+	)
+)
+
+type ProcurementService struct {
+	repository ProcurementRepository
+	clock      Clock
+	ids        IDGenerator
+}
+
+type CreateProcurementRequestCommand struct {
+	CreatorSubject           string
+	ActorUserID              string
+	FreightOrderItemID       string
+	ConfirmProcurementNeeded bool
+}
+
+type CreateProcurementRequestResult struct {
+	Request  domain.ProcurementRequest
+	Replayed bool
+}
+
+type BindProcurementReferenceCommand struct {
+	CreatorSubject string
+	ActorUserID    string
+	RequestID      string
+	ImageAssetID   string
+}
+
+type CreateProcurementTaskCommand struct {
+	CreatorSubject string
+	ActorUserID    string
+	RequestID      string
+	IdempotencyKey string
+}
+
+type CreateProcurementTaskResult struct {
+	Task     domain.PurchaseTask
+	Replayed bool
+}
+
+func NewProcurementService(
+	repository ProcurementRepository,
+	clock Clock,
+	ids IDGenerator,
+) (*ProcurementService, error) {
+	if repository == nil || clock == nil || ids == nil {
+		return nil, errors.New("procurement service dependencies are required")
+	}
+	return &ProcurementService{
+		repository: repository,
+		clock:      clock,
+		ids:        ids,
+	}, nil
+}
+
+func (service *ProcurementService) CreateRequest(
+	ctx context.Context,
+	command CreateProcurementRequestCommand,
+) (CreateProcurementRequestResult, error) {
+	command.CreatorSubject = strings.TrimSpace(command.CreatorSubject)
+	command.ActorUserID = strings.TrimSpace(command.ActorUserID)
+	command.FreightOrderItemID = strings.TrimSpace(
+		command.FreightOrderItemID,
+	)
+	fields := map[string]string{}
+	if command.CreatorSubject == "" {
+		fields["creator_subject"] = "is required"
+	}
+	if !isUUID(command.ActorUserID) {
+		fields["actor_user_id"] = "must be a UUID"
+	}
+	if !isUUID(command.FreightOrderItemID) {
+		fields["freight_order_item_id"] = "must be a UUID"
+	}
+	if !command.ConfirmProcurementNeeded {
+		fields["confirm_procurement_needed"] =
+			"must be explicitly confirmed"
+	}
+	if len(fields) > 0 {
+		return CreateProcurementRequestResult{}, invalidError(
+			"PROCUREMENT_REQUEST_INVALID",
+			"procurement request is invalid",
+			fields,
+		)
+	}
+	source, err := service.repository.GetProcurementSourceItem(
+		ctx,
+		command.CreatorSubject,
+		command.FreightOrderItemID,
+	)
+	if err != nil {
+		return CreateProcurementRequestResult{}, wrapRepositoryError(err)
+	}
+	requestID, err := service.ids.NewID()
+	if err != nil {
+		return CreateProcurementRequestResult{}, procurementInternal(err)
+	}
+	now := service.clock.Now().UTC()
+	request := domain.ProcurementRequest{
+		ID:                           requestID,
+		CreatorSubject:               command.CreatorSubject,
+		FreightOrderItemID:           source.Item.ID,
+		SourceRevision:               source.Item.Revision,
+		SourceSHA256:                 source.Item.CanonicalSHA256,
+		Title:                        strings.TrimSpace(source.Item.Title),
+		ProductSpec:                  strings.TrimSpace(source.Item.ProductSpec),
+		SKU:                          strings.TrimSpace(source.Item.SKU),
+		Quantity:                     source.Item.Quantity,
+		SourcePurchaseStatus:         source.Item.PurchaseStatus,
+		SourceIsCanceled:             source.IsCanceled,
+		ProcurementConfirmedByUserID: command.ActorUserID,
+		ProcurementConfirmedAt:       now,
+		Status:                       domain.ProcurementNeedsImage,
+		CreatedAt:                    now,
+		UpdatedAt:                    now,
+	}
+	if code := procurementBlockingCode(request); code != "" {
+		request.Status = domain.ProcurementBlocked
+		request.BlockingCode = &code
+	}
+	stored, created, err := service.repository.CreateProcurementRequest(
+		ctx,
+		request,
+	)
+	if err != nil {
+		return CreateProcurementRequestResult{}, wrapProcurementError(err)
+	}
+	return CreateProcurementRequestResult{
+		Request:  stored,
+		Replayed: !created,
+	}, nil
+}
+
+func (service *ProcurementService) ListForOrder(
+	ctx context.Context,
+	creatorSubject, orderID string,
+) ([]domain.ProcurementRequest, error) {
+	requests, err := service.repository.ListProcurementRequestsForOrder(
+		ctx,
+		strings.TrimSpace(creatorSubject),
+		strings.TrimSpace(orderID),
+	)
+	if err != nil {
+		return nil, wrapProcurementError(err)
+	}
+	return requests, nil
+}
+
+func (service *ProcurementService) Get(
+	ctx context.Context,
+	creatorSubject, requestID string,
+) (domain.ProcurementRequest, error) {
+	request, err := service.repository.GetProcurementRequest(
+		ctx,
+		strings.TrimSpace(creatorSubject),
+		strings.TrimSpace(requestID),
+	)
+	if err != nil {
+		return domain.ProcurementRequest{}, wrapProcurementError(err)
+	}
+	return request, nil
+}
+
+func (service *ProcurementService) BindReference(
+	ctx context.Context,
+	command BindProcurementReferenceCommand,
+) (domain.ProcurementRequest, error) {
+	command.CreatorSubject = strings.TrimSpace(command.CreatorSubject)
+	command.ActorUserID = strings.TrimSpace(command.ActorUserID)
+	command.RequestID = strings.TrimSpace(command.RequestID)
+	command.ImageAssetID = strings.TrimSpace(command.ImageAssetID)
+	fields := map[string]string{}
+	if command.CreatorSubject == "" {
+		fields["creator_subject"] = "is required"
+	}
+	if !isUUID(command.ActorUserID) {
+		fields["actor_user_id"] = "must be a UUID"
+	}
+	if !isUUID(command.RequestID) {
+		fields["procurement_request_id"] = "must be a UUID"
+	}
+	if !isUUID(command.ImageAssetID) {
+		fields["image_asset_id"] = "must be a UUID"
+	}
+	if len(fields) > 0 {
+		return domain.ProcurementRequest{}, invalidError(
+			"PROCUREMENT_REFERENCE_INVALID",
+			"procurement reference is invalid",
+			fields,
+		)
+	}
+	request, err := service.repository.BindProcurementReference(
+		ctx,
+		command.CreatorSubject,
+		command.RequestID,
+		command.ImageAssetID,
+		service.clock.Now().UTC(),
+	)
+	if err != nil {
+		return domain.ProcurementRequest{}, wrapProcurementError(err)
+	}
+	return request, nil
+}
+
+func (service *ProcurementService) CreateTask(
+	ctx context.Context,
+	command CreateProcurementTaskCommand,
+) (CreateProcurementTaskResult, error) {
+	if err := validateWriteIdentity(
+		command.CreatorSubject,
+		command.IdempotencyKey,
+	); err != nil {
+		return CreateProcurementTaskResult{}, err
+	}
+	command.CreatorSubject = strings.TrimSpace(command.CreatorSubject)
+	command.ActorUserID = strings.TrimSpace(command.ActorUserID)
+	command.RequestID = strings.TrimSpace(command.RequestID)
+	if !isUUID(command.ActorUserID) || !isUUID(command.RequestID) {
+		return CreateProcurementTaskResult{}, invalidError(
+			"PROCUREMENT_TASK_INVALID",
+			"procurement task request is invalid",
+			map[string]string{
+				"request": "actor and procurement request must be UUIDs",
+			},
+		)
+	}
+	request, err := service.repository.GetProcurementRequest(
+		ctx,
+		command.CreatorSubject,
+		command.RequestID,
+	)
+	if err != nil {
+		return CreateProcurementTaskResult{}, wrapProcurementError(err)
+	}
+	if request.Status != domain.ProcurementTaskCreated &&
+		request.SourceChanged {
+		return CreateProcurementTaskResult{}, wrapProcurementError(
+			ErrProcurementSourceChanged,
+		)
+	}
+	if request.Status != domain.ProcurementReady &&
+		request.Status != domain.ProcurementTaskCreated {
+		return CreateProcurementTaskResult{}, wrapProcurementError(
+			ErrProcurementStateConflict,
+		)
+	}
+	if request.ReferenceAssetID == nil {
+		return CreateProcurementTaskResult{}, wrapProcurementError(
+			ErrProcurementStateConflict,
+		)
+	}
+	taskID, err := service.ids.NewID()
+	if err != nil {
+		return CreateProcurementTaskResult{}, procurementInternal(err)
+	}
+	eventID, err := service.ids.NewID()
+	if err != nil {
+		return CreateProcurementTaskResult{}, procurementInternal(err)
+	}
+	now := service.clock.Now().UTC()
+	sourceRefValue := "erp-procurement:" + request.ID +
+		":r" + strconv.Itoa(request.SourceRevision)
+	actorUserID := command.ActorUserID
+	description := ""
+	if request.ProductSpec != "" {
+		description = "ERP 规格：" + request.ProductSpec
+	}
+	task := domain.PurchaseTask{
+		ID:              taskID,
+		CreatorSubject:  command.CreatorSubject,
+		CreatedByUserID: &actorUserID,
+		SourceRef:       &sourceRefValue,
+		Title:           request.Title,
+		Description:     description,
+		SKU:             request.SKU,
+		ImageAssetID:    *request.ReferenceAssetID,
+		Quantity:        *request.Quantity,
+		Currency:        domain.CurrencyCNY,
+		Status:          domain.TaskStatusPending,
+		Version:         1,
+		CreatedAt:       now,
+		UpdatedAt:       now,
+	}
+	if err := domain.ValidateTaskInput(
+		task.CreatorSubject,
+		task.SourceRef,
+		task.Title,
+		task.Description,
+		task.SKU,
+		task.ImageAssetID,
+		task.Quantity,
+	); err != nil {
+		return CreateProcurementTaskResult{}, wrapProcurementError(
+			ErrProcurementStateConflict,
+		)
+	}
+	event := domain.TaskEvent{
+		ID:          eventID,
+		TaskID:      task.ID,
+		ActorUserID: &actorUserID,
+		Type:        "TASK_CREATED",
+		Message:     "task created from procurement request",
+		OccurredAt:  now,
+	}
+	source := domain.PurchaseTaskSource{
+		TaskID:               task.ID,
+		ProcurementRequestID: request.ID,
+		FreightOrderItemID:   request.FreightOrderItemID,
+		SourceRevision:       request.SourceRevision,
+		SourceSHA256:         request.SourceSHA256,
+		CreatedAt:            now,
+	}
+	requestHash := hashJSON(struct {
+		RequestID    string `json:"request_id"`
+		SourceSHA256 string `json:"source_sha256"`
+	}{
+		RequestID:    request.ID,
+		SourceSHA256: request.SourceSHA256,
+	})
+	created, wasCreated, err := service.repository.CreateProcurementTask(
+		ctx,
+		request,
+		task,
+		event,
+		source,
+		strings.TrimSpace(command.IdempotencyKey),
+		requestHash,
+	)
+	if err != nil {
+		return CreateProcurementTaskResult{}, wrapProcurementError(err)
+	}
+	return CreateProcurementTaskResult{
+		Task:     created,
+		Replayed: !wasCreated,
+	}, nil
+}
+
+func procurementBlockingCode(
+	request domain.ProcurementRequest,
+) string {
+	if request.SourceIsCanceled != nil && *request.SourceIsCanceled {
+		return domain.ProcurementBlockSourceCanceled
+	}
+	if request.Title == "" ||
+		utf8.RuneCountInString(request.Title) > domain.MaxTitleRunes ||
+		len([]byte(request.Title)) > domain.MaxTitleBytes {
+		return domain.ProcurementBlockTitleRequired
+	}
+	if request.SKU == "" ||
+		len([]byte(request.SKU)) > domain.MaxSKUBytes {
+		return domain.ProcurementBlockSKURequired
+	}
+	if request.Quantity == nil || *request.Quantity <= 0 {
+		return domain.ProcurementBlockQuantityRequired
+	}
+	return ""
+}
+
+func wrapProcurementError(err error) error {
+	switch {
+	case errors.Is(err, ErrProcurementSourceChanged):
+		return newError(
+			ErrorKindConflict,
+			"PROCUREMENT_SOURCE_CHANGED",
+			"freight source changed; create a request for the current revision",
+			err,
+		)
+	case errors.Is(err, ErrProcurementStateConflict):
+		return newError(
+			ErrorKindConflict,
+			"PROCUREMENT_STATE_CONFLICT",
+			"procurement request state does not allow this operation",
+			err,
+		)
+	case errors.Is(err, ErrAssetUnavailable):
+		return newError(
+			ErrorKindConflict,
+			"PROCUREMENT_ASSET_UNAVAILABLE",
+			"reference image is not available for this procurement request",
+			err,
+		)
+	default:
+		return wrapRepositoryError(err)
+	}
+}
+
+func procurementInternal(err error) error {
+	return newError(
+		ErrorKindInternal,
+		"INTERNAL_ERROR",
+		"internal server error",
+		err,
+	)
+}
diff --git a/backend-api/migrations/00013_procurement_requests.sql b/backend-api/migrations/00013_procurement_requests.sql
new file mode 100644
index 0000000..73b074b
--- /dev/null
+++ b/backend-api/migrations/00013_procurement_requests.sql
@@ -0,0 +1,132 @@
+-- +goose Up
+CREATE TABLE procurement_requests (
+    id TEXT PRIMARY KEY NOT NULL CHECK (length(id) = 36),
+    creator_subject TEXT NOT NULL,
+    freight_order_item_id TEXT NOT NULL
+        REFERENCES freight_order_items(id)
+            ON UPDATE RESTRICT ON DELETE RESTRICT,
+    source_revision INTEGER NOT NULL CHECK (source_revision >= 1),
+    source_sha256 TEXT NOT NULL
+        CHECK (
+            length(source_sha256) = 64
+            AND source_sha256 NOT GLOB '*[^0-9a-f]*'
+        ),
+    title TEXT NOT NULL
+        CHECK (length(CAST(title AS BLOB)) <= 2048),
+    product_spec TEXT NOT NULL
+        CHECK (length(CAST(product_spec AS BLOB)) <= 1024),
+    sku TEXT NOT NULL
+        CHECK (length(CAST(sku AS BLOB)) <= 512),
+    quantity INTEGER CHECK (quantity IS NULL OR quantity > 0),
+    source_purchase_status TEXT
+        CHECK (
+            source_purchase_status IS NULL
+            OR length(CAST(source_purchase_status AS BLOB)) <= 128
+        ),
+    source_is_canceled INTEGER
+        CHECK (
+            source_is_canceled IS NULL
+            OR source_is_canceled IN (0, 1)
+        ),
+    procurement_confirmed_by_user_id TEXT NOT NULL
+        REFERENCES users(id) ON UPDATE RESTRICT ON DELETE RESTRICT,
+    procurement_confirmed_at TEXT NOT NULL,
+    status TEXT NOT NULL
+        CHECK (
+            status IN (
+                'BLOCKED',
+                'NEEDS_IMAGE',
+                'READY',
+                'TASK_CREATED',
+                'SOURCE_CHANGED'
+            )
+        ),
+    blocking_code TEXT
+        CHECK (
+            blocking_code IS NULL
+            OR blocking_code IN (
+                'SOURCE_CANCELED',
+                'TITLE_REQUIRED',
+                'SKU_REQUIRED',
+                'QUANTITY_REQUIRED',
+                'SOURCE_CHANGED'
+            )
+        ),
+    reference_asset_id TEXT UNIQUE
+        REFERENCES assets(id) ON UPDATE RESTRICT ON DELETE RESTRICT,
+    purchase_task_id TEXT UNIQUE
+        REFERENCES purchase_tasks(id)
+            ON UPDATE RESTRICT ON DELETE RESTRICT,
+    created_at TEXT NOT NULL,
+    updated_at TEXT NOT NULL,
+    UNIQUE (freight_order_item_id, source_revision),
+    CHECK (
+        (status = 'BLOCKED'
+            AND blocking_code IS NOT NULL
+            AND reference_asset_id IS NULL
+            AND purchase_task_id IS NULL)
+        OR (status = 'NEEDS_IMAGE'
+            AND blocking_code IS NULL
+            AND reference_asset_id IS NULL
+            AND purchase_task_id IS NULL)
+        OR (status = 'READY'
+            AND blocking_code IS NULL
+            AND reference_asset_id IS NOT NULL
+            AND purchase_task_id IS NULL)
+        OR (status = 'TASK_CREATED'
+            AND blocking_code IS NULL
+            AND reference_asset_id IS NOT NULL
+            AND purchase_task_id IS NOT NULL)
+        OR (status = 'SOURCE_CHANGED'
+            AND blocking_code = 'SOURCE_CHANGED'
+            AND purchase_task_id IS NULL)
+    )
+);
+
+CREATE INDEX procurement_requests_creator_updated_idx
+    ON procurement_requests (creator_subject, updated_at DESC, id DESC);
+
+CREATE INDEX procurement_requests_item_created_idx
+    ON procurement_requests (
+        freight_order_item_id,
+        source_revision DESC,
+        id DESC
+    );
+
+CREATE TABLE purchase_task_sources (
+    task_id TEXT PRIMARY KEY NOT NULL
+        REFERENCES purchase_tasks(id)
+            ON UPDATE RESTRICT ON DELETE RESTRICT,
+    procurement_request_id TEXT NOT NULL UNIQUE
+        REFERENCES procurement_requests(id)
+            ON UPDATE RESTRICT ON DELETE RESTRICT,
+    freight_order_item_id TEXT NOT NULL
+        REFERENCES freight_order_items(id)
+            ON UPDATE RESTRICT ON DELETE RESTRICT,
+    source_revision INTEGER NOT NULL CHECK (source_revision >= 1),
+    source_sha256 TEXT NOT NULL
+        CHECK (
+            length(source_sha256) = 64
+            AND source_sha256 NOT GLOB '*[^0-9a-f]*'
+        ),
+    created_at TEXT NOT NULL
+);
+
+-- +goose Down
+CREATE TEMP TABLE procurement_v13_down_guard (
+    allowed INTEGER NOT NULL CHECK (allowed = 1)
+);
+
+INSERT INTO procurement_v13_down_guard (allowed)
+SELECT CASE
+    WHEN EXISTS (SELECT 1 FROM procurement_requests)
+      OR EXISTS (SELECT 1 FROM purchase_task_sources)
+    THEN 0
+    ELSE 1
+END;
+
+DROP TABLE procurement_v13_down_guard;
+DROP TABLE purchase_task_sources;
+DROP INDEX procurement_requests_item_created_idx;
+DROP INDEX procurement_requests_creator_updated_idx;
+DROP TABLE procurement_requests;
diff --git a/docs/api.md b/docs/api.md
index be7dbe2..4b92847 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -257,18 +257,41 @@ Connector 未登录、找不到货运单、响应协议错误和暂时不可用
 
 ### `POST /api/v1/freight-items/{item_id}/procurement-request`
 
-T-223 创建或重放该商品当前 revision 的采购需求。标题、SKU/规格或数量不合法时返回
-`422 FREIGHT_ITEM_NOT_PURCHASABLE`；不调用 VLM 补字段。
+T-223 创建或重放该商品当前 revision 的采购需求。ERP 数字状态不自动解释，ADMIN
+必须显式确认仍需采购：
+
+```json
+{"confirm_procurement_needed":true}
+```
+
+请求快照保留 title、product spec、SKU、quantity、来源 hash/revision 和当时的取消/
+采购状态。缺标题、SKU、正整数数量或来源明确取消时创建为 `BLOCKED`，不调用 VLM
+补字段；字段合格但没有受控参考图时为 `NEEDS_IMAGE`。
 
 ### `PUT /api/v1/procurement-requests/{id}/reference-asset`
 
 绑定当前 ADMIN 已上传的 `TASK_REFERENCE` asset。asset 必须尚未属于其他任务/请求，
-内容仍走既有解码、像素、规范化和 hash 校验。
+内容仍走既有解码、像素、规范化和 hash 校验。请求体：
+
+```json
+{"image_asset_id":"2bbc1bf2-30f7-497e-a52b-bcb4c61d57c3"}
+```
+
+绑定成功后进入 `READY`。来源 revision/hash 或货运取消标记已变化时返回
+`409 PROCUREMENT_SOURCE_CHANGED`。
 
 ### `POST /api/v1/procurement-requests/{id}/purchase-task`
 
-必须带 `Idempotency-Key`。只有 `READY` request 可生成任务；同一 request revision
-并发或重试返回同一 task。来源后续更新不修改已生成任务。
+必须带 `Idempotency-Key`，请求体是空 JSON 对象 `{}`。只有 `READY` request 可生成
+任务；task、`purchase_task_sources` 和 request 的 `TASK_CREATED` 状态在同一事务内
+提交。同一 request revision 即使使用不同幂等 key 重试也返回同一 task。来源后续
+更新只显示 `source_changed=true`，不修改 PENDING、CLAIMED、RUNNING 或终态任务。
+
+管理 Web 在 `/freight/{id}` 内提供对应的人工确认、参考图上传和生成任务操作；写操作
+分别使用 `/freight/items/{id}/procurement-request`、
+`/freight/procurement-requests/{id}/reference` 和
+`/freight/procurement-requests/{id}/purchase-task`，均受 ADMIN session 与 CSRF
+保护。
 
 ## 采购任务
 
diff --git a/docs/current-state.md b/docs/current-state.md
index af5d1dc..7286890 100644
--- a/docs/current-state.md
+++ b/docs/current-state.md
@@ -5,7 +5,7 @@
 ## 当前快照
 
 - 日期：2026-07-28
-- 阶段：T-222 已完成，T-223 待采购需求提取与任务生成已领取
+- 阶段：T-223 已完成，T-224 ERP 日期增量同步已领取
 - Git：当前分支为 `main`；T-001 至 T-004、T-101 至 T-104、T-201 至 T-219
   均按文档提交、实现提交的顺序纳入历史
 - 生产代码：`android-buyer/` 已接入 Roubao Android 源码
@@ -17,14 +17,16 @@
 - ERP 货运：Go 后端通过仅限 loopback、服务密钥鉴权的 Python Connector 异步按
   完整单号同步；v12 保存同步记录、货运头和全部明细，canonical hash 控制 revision，
   Admin 已有 `/freight`、`/freight/import`、`/freight/{id}` 与对应 JSON API。
+- 采购需求：v13 按货运商品 revision 保存可复核快照；ADMIN 显式确认采购、上传参考
+  图后生成不可变 PENDING 任务。来源变化不会改写任务，Roubao 可沿用现有 claim 流程。
 - 本机 Android 工具：JDK 17.0.13、Command-line Tools 22.0、SDK 34、
   Build Tools 34.0.0、Platform Tools/ADB 37.0.0；用户级 SDK 环境变量已设置
 - Android Studio：未安装；`winget` 静默安装卡住后已终止，不阻塞命令行构建
 - 测试：T-219 Android Debug/Release 单元测试与构建和根 `init.ps1` 通过；
   Debug APK `1.4.16 (21)` 已覆盖安装到 PKG110
-- 后端测试：T-222 运行 `go test ./...`、`go test -race ./...`、`go vet ./...`；
-  覆盖货运 migration 降级保护、严格 Connector 字段白名单、重复导入/revision、
-  中断恢复、Admin API/SSR 鉴权和 PII 缺失断言
+- 后端测试：T-223 运行 `go test ./...`、`go test -race ./...`、`go vet ./...`；
+  覆盖采购需求 migration 降级保护、一商品一需求、阻塞字段、图片唯一绑定、任务
+  并发重放、来源变化后任务不变、Roubao claim 和 Admin API/SSR
 - 原型：4 个管理 Web 页面和 7 个 Android 页面均可离线独立打开；Playwright
   以 1440×900、390×844、360×800 验证 36 个页面/视口组合，无页面横向溢出、
   脚本错误或外部请求，Android 可见交互控件均不小于 44px
@@ -162,8 +164,8 @@
 | `docs/tasks/T-220.md` | DONE | 顺运宝 ERP 字段契约与凭证安全基线 |
 | `docs/tasks/T-221.md` | DONE | 顺运宝精确单号 Connector |
 | `docs/tasks/T-222.md` | DONE | 货运信息存储、API 与 Admin 页面 |
-| `docs/tasks/T-223.md` | DOING | 待采购需求提取与任务生成 |
-| `docs/tasks/T-224.md` | TODO | ERP 日期增量同步 |
+| `docs/tasks/T-223.md` | DONE | 待采购需求提取与任务生成 |
+| `docs/tasks/T-224.md` | DOING | ERP 日期增量同步 |
 | `docs/design/` | 已确认 | T-202 原型索引、4 个管理页和 7 个 Android 页面 |
 | `deepseek总结.txt` | 已有 | 历史讨论摘要，不是正式需求权威 |
 | `android-buyer/` | 已有 | Roubao `main` 固定 commit 的 Android 基线 |
@@ -176,8 +178,8 @@
 ## 任务摘要
 
 - 已完成：T-001 至 T-004、T-101 至 T-104、T-201 至 T-219。
-- 已完成：另含 T-220 至 T-222 ERP 契约、Connector、货运存储/API/Admin。
-- 进行中：T-223 待采购需求提取与任务生成。
+- 已完成：另含 T-220 至 T-223 ERP 契约、Connector、货运存储和采购需求生成。
+- 进行中：T-224 ERP 日期增量同步。
 - 下一步：完成 T-223 采购需求生成和 T-224 日期增量同步，再进入 T-301 P0 UI
   完整交互验收。
 
diff --git a/docs/tasks/T-223.md b/docs/tasks/T-223.md
index 4829bdc..8239e0e 100644
--- a/docs/tasks/T-223.md
+++ b/docs/tasks/T-223.md
@@ -4,7 +4,7 @@ title: 待采购需求提取与任务生成
 phase: 2
 deps:
   - T-222
-status: TODO
+status: DONE
 created: 2026-07-28
 context_ref: 78dc595
 work_branch: null
@@ -50,11 +50,11 @@ Roubao 队列。
 
 ## 验收要点
 
-- [ ] 一货运单多商品形成多条独立采购需求。
-- [ ] 缺标题/SKU/数量/图片和来源状态不明时不能生成任务。
-- [ ] 同一 revision 并发/重试只生成一个采购任务。
-- [ ] 来源变化不覆写 PENDING/CLAIMED/RUNNING/终态任务。
-- [ ] 生成任务可被现有 Roubao claim，原始字段和参考图 hash 一致。
+- [x] 一货运单多商品形成多条独立采购需求。
+- [x] 缺标题/SKU/数量/图片、明确取消或未人工确认时不能生成任务。
+- [x] 同一 revision 并发/重试只生成一个采购任务。
+- [x] 来源变化不覆写 PENDING/CLAIMED/RUNNING/终态任务。
+- [x] 生成任务可被现有 Roubao claim，原始字段和参考图 hash 一致。
 
 ## 边界
 
@@ -65,3 +65,10 @@ Roubao 队列。
 ## 执行记录
 
 - 2026-07-28：任务合约已冻结，等待 T-222。
+- 2026-07-28：新增 v13 `procurement_requests` 与不可变
+  `purchase_task_sources`；来源数字状态不猜测，由 ADMIN 显式确认是否仍需采购。
+- 2026-07-28：参考图绑定、任务和来源快照采用唯一约束与单事务；ERP 更新后旧任务
+  保持原始标题、SKU、数量和 asset，旧请求显示来源变化，当前 revision 可新建需求。
+- 2026-07-28：真实 Gin/SQLite SSR 流程完成确认需求、上传规范化参考图、生成 PENDING
+  任务；同任务可由既有 Roubao claim。Playwright 三种视口无横向溢出、短按钮或页头
+  重叠；未调用 VLM 或真实 ERP。