diff --git a/contract/jktj.go b/contract/jktj.go
new file mode 100644
index 0000000..1e7ba10
--- /dev/null
+++ b/contract/jktj.go
@@ -0,0 +1,19 @@
+package contract
+
+// 健康体检查询契约（JKTJ）。
+//
+// 体检记录字段极多（实测最近一次样本约 260 项，分 4 个 object 子节点 +
+// 3 个 array 子节点，见 docs/04 §11）。查询场景只需定位/摘要字段即可，
+// 完整内容由 osi.Result.Raw 原样保留；全量字段的强类型建模留到体检 create
+// 任务（写入映射才真正需要每个字段），避免照单样本猜 null 字段类型。
+//
+// 注意与档案的两处差异：
+//   - 最近一次体检 data 是**单个对象**（档案 find 的 data 是数组）。
+//   - 体检身份证字段是小写 `idcard`（档案是 `idCard`）。
+type HealthCheckSummary struct {
+	CheckID     string `json:"checkId"`     // 体检记录主键；各子节点用 healthCheck 外键指向它
+	HealthCheck string `json:"healthCheck"` // 冗余外键，值等于 checkId
+	IDCard      string `json:"idcard"`      // 体检用小写 idcard
+	PersonName  string `json:"personName"`
+	CheckDate   string `json:"checkDate"`
+}
diff --git a/osi/codes.go b/osi/codes.go
index 0b5d7ec..ec1cfa4 100644
--- a/osi/codes.go
+++ b/osi/codes.go
@@ -14,6 +14,11 @@ const (
 	ServiceIDDoctors      = "ZRYS00001"
 	ServiceIDDrugs        = "YPML00001"
 	ServiceIDOrgs         = "CXJG00002"
+
+	ServiceIDJKTJLast = "JKTJLSJL00002" // 最近一次体检（实测可用）
+	ServiceIDJKTJList = "JKTJLIST00002" // 已检/待检人员列表（入参待厂家确认）
+	// 单条查询 JKTJ00002：docx 标 auto/jktj/query，平台实测"没有url的接口配置"（未部署），
+	// auto/jktj/find 待确认；确认前不登记路由。见 docs/04 §11、docs/06 B5。
 )
 
 const codeRetryableTimeout = "405"
@@ -27,6 +32,8 @@ var servicePaths = map[string]string{
 	ServiceIDDoctors:      "/auto/zryscx/query",
 	ServiceIDDrugs:        "/auto/ypmlcx/query",
 	ServiceIDOrgs:         "/auto/cxjg/query",
+	ServiceIDJKTJLast:     "/auto/jktjlscx/query",
+	ServiceIDJKTJList:     "/auto/jktjlist/query",
 }
 
 func PathOf(serviceID string) (string, error) {
diff --git a/osi/jktj.go b/osi/jktj.go
new file mode 100644
index 0000000..6a94c24
--- /dev/null
+++ b/osi/jktj.go
@@ -0,0 +1,34 @@
+package osi
+
+import (
+	"context"
+
+	"chis_osi/contract"
+)
+
+type FindHealthCheckQuery struct {
+	IDCard string
+	PHRID  string
+	EMPIID string
+}
+
+// LastHealthCheck 查询某人最近一次体检（JKTJLSJL00002 /auto/jktjlscx/query）。
+// data 为单个体检对象（非数组）；summary 只取定位字段，完整内容见返回的 Result.Raw。
+func (c *Client) LastHealthCheck(ctx context.Context, query FindHealthCheckQuery) (contract.HealthCheckSummary, Result, error) {
+	baseInfo, err := query.baseInfo()
+	if err != nil {
+		return contract.HealthCheckSummary{}, Result{}, err
+	}
+	var summary contract.HealthCheckSummary
+	result, err := c.Call(ctx, ServiceIDJKTJLast, baseInfo, &summary)
+	return summary, result, err
+}
+
+func (q FindHealthCheckQuery) baseInfo() (map[string]string, error) {
+	fields := []queryField{
+		{name: "idCard", value: q.IDCard},
+		{name: "empiId", value: q.EMPIID},
+		{name: "phrid", value: q.PHRID},
+	}
+	return singleBaseInfo("last health check", fields)
+}
diff --git a/osi/jktj_test.go b/osi/jktj_test.go
new file mode 100644
index 0000000..41f14c5
--- /dev/null
+++ b/osi/jktj_test.go
@@ -0,0 +1,57 @@
+package osi
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+)
+
+func TestLastHealthCheckDecodesSummaryAndHitsPath(t *testing.T) {
+	var seenPath string
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		seenPath = r.URL.Path
+		w.Header().Set("Content-Type", "application/json")
+		// data 为单个对象（非数组）；字段名取自实测结构，值均为脱敏假数据
+		_, _ = w.Write([]byte(`{"code":"01","message":"操作成功","data":{"checkId":"CHK-TEST-001","healthCheck":"CHK-TEST-001","idcard":"TEST-ID","personName":"测试","checkDate":"2026-01-01"}}`))
+	}))
+	defer server.Close()
+
+	transport, err := NewTransport(TransportConfig{Timeout: time.Second})
+	if err != nil {
+		t.Fatalf("NewTransport: %v", err)
+	}
+	client := NewClient(ClientConfig{BaseURL: server.URL, UserName: "u", Ask: "k", Transport: transport})
+
+	summary, result, err := client.LastHealthCheck(context.Background(), FindHealthCheckQuery{IDCard: "TEST-ID"})
+	if err != nil {
+		t.Fatalf("LastHealthCheck: %v", err)
+	}
+	if seenPath != "/osi/api/auto/jktjlscx/query" {
+		t.Fatalf("path = %q", seenPath)
+	}
+	if summary.CheckID != "CHK-TEST-001" || summary.HealthCheck != "CHK-TEST-001" {
+		t.Fatalf("summary keys = %#v", summary)
+	}
+	// 体检身份证是小写 idcard，确认 tag 正确映射
+	if summary.IDCard != "TEST-ID" {
+		t.Fatalf("summary.IDCard = %q (体检 idcard tag 映射错误)", summary.IDCard)
+	}
+	if !result.Success || len(result.Raw) == 0 {
+		t.Fatalf("result should be success with raw retained: %#v", result)
+	}
+}
+
+func TestFindHealthCheckQueryRequiresExactlyOneKey(t *testing.T) {
+	if _, err := (FindHealthCheckQuery{}).baseInfo(); err == nil {
+		t.Fatal("empty query should error")
+	}
+	if _, err := (FindHealthCheckQuery{IDCard: "a", PHRID: "b"}).baseInfo(); err == nil {
+		t.Fatal("two keys should error")
+	}
+	bi, err := (FindHealthCheckQuery{IDCard: "a"}).baseInfo()
+	if err != nil || bi["idCard"] != "a" {
+		t.Fatalf("baseInfo = %v err = %v", bi, err)
+	}
+}