diff --git a/client/src/settings_ui.py b/client/src/settings_ui.py
index 6d90435..4a76f57 100644
--- a/client/src/settings_ui.py
+++ b/client/src/settings_ui.py
@@ -10,7 +10,7 @@
 from dataclasses import dataclass
 from typing import Iterable, Optional
 
-from PyQt5.QtCore import QAbstractTableModel, QModelIndex, Qt, pyqtSignal
+from PyQt5.QtCore import QAbstractTableModel, QEvent, QModelIndex, Qt, pyqtSignal
 from PyQt5.QtWidgets import (
     QAbstractItemView,
     QFormLayout,
@@ -63,9 +63,12 @@ class AndroidDeviceTableModel(QAbstractTableModel):
         super().__init__(parent)
         self._rows: list[AndroidDeviceRow] = []
         self._checked_serial = ""
+        self._placeholder_row_count = 1
 
     def rowCount(self, parent=QModelIndex()) -> int:
-        return 0 if parent.isValid() else len(self._rows)
+        if parent.isValid():
+            return 0
+        return len(self._rows) or self._placeholder_row_count
 
     def columnCount(self, parent=QModelIndex()) -> int:
         return 0 if parent.isValid() else len(self.HEADERS)
@@ -107,7 +110,7 @@ class AndroidDeviceTableModel(QAbstractTableModel):
         return None
 
     def flags(self, index):
-        if not index.isValid():
+        if not index.isValid() or index.row() >= len(self._rows):
             return Qt.NoItemFlags
 
         flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable
@@ -118,6 +121,7 @@ class AndroidDeviceTableModel(QAbstractTableModel):
     def setData(self, index, value, role=Qt.EditRole) -> bool:
         if (
             not index.isValid()
+            or index.row() >= len(self._rows)
             or index.column() != 0
             or role != Qt.CheckStateRole
             or self._rows[index.row()].status != "device"
@@ -145,6 +149,18 @@ class AndroidDeviceTableModel(QAbstractTableModel):
         if checked_serial != self._checked_serial:
             self.checkedDeviceChanged.emit(self._checked_serial)
 
+    def set_placeholder_row_count(self, count: int) -> None:
+        """设置空设备列表占位行数，真实设备行不受影响。"""
+
+        count = max(1, count)
+        if self._rows or count == self._placeholder_row_count:
+            self._placeholder_row_count = count
+            return
+
+        self.beginResetModel()
+        self._placeholder_row_count = count
+        self.endResetModel()
+
     def set_checked_serial(self, serial: str) -> None:
         """勾选一台正常设备；传空字符串清除勾选。"""
 
@@ -235,6 +251,7 @@ class SettingsPage(QWidget):
         self.deviceTable.setColumnWidth(1, 210)
         self.deviceTable.setColumnWidth(2, 96)
         self.deviceTable.setColumnWidth(4, 112)
+        self.deviceTable.viewport().installEventFilter(self)
         header = self.deviceTable.horizontalHeader()
         header.setSectionResizeMode(0, QHeaderView.Fixed)
         header.setSectionResizeMode(1, QHeaderView.Interactive)
@@ -266,6 +283,19 @@ class SettingsPage(QWidget):
         layout.setContentsMargins(0, 0, 0, 0)
         layout.addWidget(scrollArea)
 
+    def eventFilter(self, watched, event):
+        if watched is self.deviceTable.viewport() and event.type() == QEvent.Resize:
+            self._update_device_placeholder_rows()
+        return super().eventFilter(watched, event)
+
+    def _update_device_placeholder_rows(self) -> None:
+        """用不可交互空行填满 Android 设备表格的可视区域。"""
+
+        row_height = max(1, self.deviceTable.verticalHeader().defaultSectionSize())
+        viewport_height = max(row_height, self.deviceTable.viewport().height())
+        row_count = max(1, viewport_height // row_height)
+        self.deviceTableModel.set_placeholder_row_count(row_count)
+
     def _build_current_device_card(self) -> CardWidget:
         card = CardWidget(self)
         card.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
@@ -323,6 +353,7 @@ class SettingsPage(QWidget):
         """显示后续 ADB 服务返回的设备列表。"""
 
         self.deviceTableModel.set_devices(devices)
+        self._update_device_placeholder_rows()
 
     def set_saved_android_device(self, serial: str) -> None:
         """显示已经保存并实际用于自动化的 Android 设备。"""