diff --git a/inventory-backend/app/api/v1/warehouse.py b/inventory-backend/app/api/v1/warehouse.py
index f002e2e..6b7a351 100644
--- a/inventory-backend/app/api/v1/warehouse.py
+++ b/inventory-backend/app/api/v1/warehouse.py
@@ -54,6 +54,41 @@ def get_tree():
         }), 500
 
 
+@warehouse_bp.route('/children', methods=['GET'])
+def get_children():
+    """
+    懒加载：获取指定库位的直接子节点（parent_id 省略/为空 = 顶层）。
+    每个节点附带 has_children 标记，前端据此渲染「进入下级」而非点进去才知道。
+    与 /tree 行为一致（不额外过滤 is_enabled、按 name 升序）。
+    """
+    try:
+        parent_id = request.args.get('parent_id', type=int)
+        if parent_id is None:
+            nodes = SysWarehouseLocation.query.filter(
+                SysWarehouseLocation.parent_id.is_(None)
+            ).order_by(SysWarehouseLocation.name.asc()).all()
+        else:
+            nodes = SysWarehouseLocation.query.filter(
+                SysWarehouseLocation.parent_id == parent_id
+            ).order_by(SysWarehouseLocation.name.asc()).all()
+
+        # 一次查询所有"有子节点"的 parent_id，用于 has_children 判断（避免 N+1）
+        parent_with_children = set(
+            cid for (cid,) in db.session.query(SysWarehouseLocation.parent_id)
+            .filter(SysWarehouseLocation.parent_id.isnot(None)).distinct().all()
+        )
+
+        data = []
+        for node in nodes:
+            d = node.to_dict()
+            d['has_children'] = node.id in parent_with_children
+            data.append(d)
+
+        return jsonify({'code': 200, 'msg': 'success', 'data': data})
+    except Exception as e:
+        return jsonify({'code': 500, 'msg': str(e), 'data': None}), 500
+
+
 @warehouse_bp.route('', methods=['POST'])
 @jwt_required()
 @audit_log(
diff --git a/inventory-web/src/api/common/warehouse.ts b/inventory-web/src/api/common/warehouse.ts
index 955b7da..c3685bc 100644
--- a/inventory-web/src/api/common/warehouse.ts
+++ b/inventory-web/src/api/common/warehouse.ts
@@ -8,6 +8,15 @@ export function getWarehouseTree() {
   })
 }
 
+// 懒加载：获取指定库位的直接子节点（parentId 省略/为空 = 顶层）
+export function getWarehouseChildren(parentId?: number | null) {
+  return request({
+    url: '/v1/warehouse/children',
+    method: 'get',
+    params: parentId != null ? { parent_id: parentId } : {}
+  })
+}
+
 // 创建库位
 export function createWarehouse(data: any) {
   return request({
diff --git a/inventory-web/src/components/WarehouseSelector.vue b/inventory-web/src/components/WarehouseSelector.vue
index 4e3f9f2..ced5383 100644
--- a/inventory-web/src/components/WarehouseSelector.vue
+++ b/inventory-web/src/components/WarehouseSelector.vue
@@ -69,18 +69,18 @@
               <!-- 左侧热区：点击进入下级或选中 -->
               <div
                 class="item-main"
-                :class="{ 'has-children': item.children && item.children.length > 0 }"
+                :class="{ 'has-children': hasChild(item) }"
                 @click="handleItemClick(item)"
               >
                 <el-icon class="item-icon"><Location /></el-icon>
                 <span class="item-name">{{ item.name }}</span>
-                <el-icon v-if="item.children && item.children.length > 0" class="item-arrow">
+                <el-icon v-if="hasChild(item)" class="item-arrow">
                   <ArrowRight />
                 </el-icon>
               </div>
               <!-- 右侧操作区 -->
               <div class="item-actions">
-                <el-tag v-if="!item.children || item.children.length === 0" type="info" size="small">
+                <el-tag v-if="!hasChild(item)" type="info" size="small">
                   末级
                 </el-tag>
                 <el-button
@@ -102,26 +102,27 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed, watch } from 'vue'
+import { ref, reactive, computed, watch } from 'vue'
 import { ArrowDown, ArrowLeft, ArrowRight, Location } from '@element-plus/icons-vue'
 import { ElMessage } from 'element-plus'
+import { getWarehouseChildren } from '@/api/common/warehouse'
 
 interface WarehouseItem {
   id: number
+  parent_id: number | null
   name: string
   full_path: string
   level: number
+  has_children?: boolean
   children?: WarehouseItem[]
 }
 
 interface Props {
   modelValue?: string
-  options: WarehouseItem[]
 }
 
 const props = withDefaults(defineProps<Props>(), {
-  modelValue: '',
-  options: () => []
+  modelValue: ''
 })
 
 const emit = defineEmits<{
@@ -131,83 +132,86 @@ const emit = defineEmits<{
 const popoverRef = ref()
 const popoverVisible = ref(false)
 const triggerRef = ref<HTMLElement>()
+const loadingKey = ref<string | null>(null)
 
 // 当前导航路径（保存每一层的节点信息）
 const currentPath = ref<WarehouseItem[]>([])
 
-// 当前显示的列表数据
-const currentList = computed(() => {
-  if (currentPath.value.length === 0) {
-    // 顶层：显示根节点列表
-    return props.options
-  }
-  // 非顶层：显示当前层级最后一个节点的 children
-  const lastNode = currentPath.value[currentPath.value.length - 1]
-  return lastNode?.children || []
+// ★ 懒加载缓存：key = 'root'（顶层）或 String(parentId)
+const cache = reactive<Record<string, WarehouseItem[]>>({})
+
+// 是否有下一级（优先用后端 has_children，兼容旧树结构的 children 字段）
+const hasChild = (item: WarehouseItem): boolean =>
+  !!item.has_children || !!(item.children && item.children.length > 0)
+
+// 当前层缓存 key（'root' 或父节点 id）
+const currentParentKey = computed<string>(() => {
+  if (currentPath.value.length === 0) return 'root'
+  return String(currentPath.value[currentPath.value.length - 1].id)
 })
 
-// 监听弹窗显示状态，恢复选中层级
-watch(popoverVisible, (visible) => {
+// 当前层父 id（null = 顶层）
+const currentParentId = computed<number | null>(() => {
+  if (currentPath.value.length === 0) return null
+  return currentPath.value[currentPath.value.length - 1].id
+})
+
+// 当前显示的列表（懒加载缓存）
+const currentList = computed<WarehouseItem[]>(() => cache[currentParentKey.value] || [])
+
+// 懒加载某层子节点（已缓存则跳过）
+const ensureLoaded = async (key: string, parentId: number | null) => {
+  if (cache[key]) return
+  if (loadingKey.value === key) return
+  loadingKey.value = key
+  try {
+    const res: any = await getWarehouseChildren(parentId)
+    cache[key] = res.data || []
+  } catch (e) {
+    cache[key] = []  // 失败置空，避免下次重复请求
+  } finally {
+    loadingKey.value = null
+  }
+}
+
+// 打开弹窗：加载顶层，有选中值时逐级恢复导航路径
+watch(popoverVisible, async (visible) => {
   if (visible) {
-    restoreSelection()
+    currentPath.value = []
+    await ensureLoaded('root', null)
+    if (props.modelValue) {
+      await restoreSelection(props.modelValue)
+    }
   }
 })
 
-// 根据 modelValue 恢复选择状态
-const restoreSelection = () => {
-  if (!props.modelValue) {
-    // 无选中值，重置到顶层
-    currentPath.value = []
-    return
-  }
-
-  // 根据 full_path 查找父级路径
-  const path = findPathByFullPath(props.options, props.modelValue)
-  if (path) {
-    // 找到路径：还原 currentPath（不包含最后一个节点，因为它是当前选中的节点）
-    currentPath.value = path
-  } else {
-    // 未找到（可能树结构已变化），重置到顶层
-    currentPath.value = []
+// 按 full_path 逐级懒加载并恢复路径（不含末级节点本身，末级是待选中的）
+const restoreSelection = async (fullPath: string) => {
+  const parts = fullPath.split('/').filter(Boolean)
+  if (parts.length <= 1) return  // 顶层库位无需恢复子路径
+  for (let i = 0; i < parts.length - 1; i++) {
+    const key = i === 0 ? 'root' : String(currentPath.value[i - 1]?.id ?? '')
+    const parentId = i === 0 ? null : (currentPath.value[i - 1]?.id ?? null)
+    await ensureLoaded(key, parentId)
+    const list = cache[key] || []
+    const expected = parts.slice(0, i + 1).join('/')
+    const node = list.find((n) => n.full_path === expected)
+    if (!node) {
+      currentPath.value = []  // 树结构可能变化，回到顶层
+      return
+    }
+    currentPath.value.push(node)
   }
 }
 
-// 根据 full_path 在树中查找从根到目标节点的路径
-const findPathByFullPath = (
-  tree: WarehouseItem[],
-  targetFullPath: string,
-  currentPath: WarehouseItem[] = []
-): WarehouseItem[] | null => {
-  for (const node of tree) {
-    // 检查当前节点是否匹配
-    if (node.full_path === targetFullPath) {
-      return currentPath
-    }
-
-    // 递归检查子节点
-    if (node.children && node.children.length > 0) {
-      const result = findPathByFullPath(node.children, targetFullPath, [...currentPath, node])
-      if (result) {
-        return result
-      }
-    }
-  }
-  return null
-}
-
-// 处理弹窗显示/隐藏
+// 弹窗可见性变化
 const handleVisibleChange = (visible: boolean) => {
   popoverVisible.value = visible
-  if (!visible) {
-    // 关闭时重置导航
-    currentPath.value = []
-  }
+  if (!visible) currentPath.value = []
 }
 
 // 打开弹窗
-const handleOpen = () => {
-  popoverVisible.value = true
-}
+const handleOpen = () => { popoverVisible.value = true }
 
 // 清空选择
 const handleClear = () => {
@@ -217,28 +221,23 @@ const handleClear = () => {
 
 // 返回上一级
 const handleBack = () => {
-  if (currentPath.value.length > 0) {
-    currentPath.value.pop()
-  }
+  if (currentPath.value.length > 0) currentPath.value.pop()
 }
 
 // 返回顶层
-const handleGoHome = () => {
-  currentPath.value = []
-}
+const handleGoHome = () => { currentPath.value = [] }
 
-// 进入下一级
-const handleDrillDown = (item: WarehouseItem) => {
+// 进入下一级：先确保子级已加载，再推入导航
+const handleDrillDown = async (item: WarehouseItem) => {
+  await ensureLoaded(String(item.id), item.id)
   currentPath.value.push(item)
 }
 
-// 点击列表项 - 左侧热区逻辑
+// 点击列表项
 const handleItemClick = (item: WarehouseItem) => {
-  if (item.children && item.children.length > 0) {
-    // 有子节点：进入下一级
+  if (hasChild(item)) {
     handleDrillDown(item)
   } else {
-    // 末级：直接选中
     handleSelect(item)
   }
 }
diff --git a/inventory-web/src/views/stock/inbound/buy.vue b/inventory-web/src/views/stock/inbound/buy.vue
index 7c3c293..0ef4860 100644
--- a/inventory-web/src/views/stock/inbound/buy.vue
+++ b/inventory-web/src/views/stock/inbound/buy.vue
@@ -384,10 +384,7 @@
                 </el-col>
                 <el-col :span="6">
                   <el-form-item label="库位" prop="warehouse_location">
-                    <WarehouseSelector
-                      v-model="form.warehouse_location"
-                      :options="warehouseOptions"
-                    />
+                    <WarehouseSelector v-model="form.warehouse_location" />
                   </el-form-item>
                 </el-col>
               </el-row>
@@ -806,7 +803,6 @@ import {
 } from '@/api/inbound/buy'
 import { getApprovedUnstockedRequests } from '@/api/purchase'
 import {getLabelPreview, executePrint} from '@/api/common/print'
-import { getWarehouseTree } from '@/api/common/warehouse'
 import { usePasteUpload } from '@/hooks/usePasteUpload'
 import WebRtcCamera from '@/components/Camera/WebRtcCamera.vue'
 import WarehouseSelector from '@/components/WarehouseSelector.vue'
@@ -980,9 +976,6 @@ const purchaseImportPage = ref(1)
 const purchaseImportKeyword = ref('')
 const purchaseImportSelected = ref<any>(null)
 
-// 库位级联选择器数据
-const warehouseOptions = ref<any[]>([])
-
 const advancedFilterVisible = ref(false)
 const advancedConditions = ref([{ field: '', operator: '', value: '' }])
 const fieldOptions = computed(() => {
@@ -1575,17 +1568,6 @@ const buildCategoryTree = (categories: string[]) => {
   return root;
 };
 
-// 加载库位树数据
-const loadWarehouseTree = async () => {
-  try {
-    const res = await getWarehouseTree()
-    if (res.code === 200) {
-      warehouseOptions.value = res.data || []
-    }
-  } catch (e) {
-    console.error('加载库位树失败', e)
-  }
-}
 
 const resetQuery = () => {
   queryParams.keyword = ''
@@ -2130,7 +2112,6 @@ onMounted(() => {
   initColumnPermissions()
   fetchData()
   fetchOptions()
-  loadWarehouseTree()
 })
 </script>
 
diff --git a/inventory-web/src/views/stock/inbound/product.vue b/inventory-web/src/views/stock/inbound/product.vue
index 611106c..d8c72ea 100644
--- a/inventory-web/src/views/stock/inbound/product.vue
+++ b/inventory-web/src/views/stock/inbound/product.vue
@@ -354,10 +354,7 @@
               <el-row :gutter="24">
                 <el-col :span="6"><el-form-item label="SKU" prop="sku"><el-input v-model="form.sku" placeholder="自动生成" disabled /></el-form-item></el-col>
                 <el-col :span="6"><el-form-item label="库位" prop="warehouse_location">
-                  <WarehouseSelector
-                    v-model="form.warehouse_location"
-                    :options="warehouseOptions"
-                  />
+                  <WarehouseSelector v-model="form.warehouse_location" />
                 </el-form-item></el-col>
                 <el-col :span="6"><el-form-item label="入库日期"><el-date-picker v-model="form.in_date" type="date" value-format="YYYY-MM-DD" style="width:100%" disabled /></el-form-item></el-col>
               </el-row>
@@ -620,7 +617,6 @@ import WarehouseSelector from '@/components/WarehouseSelector.vue'
 import SmartScannerDialog from '@/components/SmartScannerDialog.vue'
 import TrackScanDialog from '@/components/TrackScanDialog.vue'
 import { getLabelPreview, executePrint } from '@/api/common/print'
-import { getWarehouseTree } from '@/api/common/warehouse'
 import { usePasteUpload } from '@/hooks/usePasteUpload'
 import { useUserStore } from '@/stores/user'
 
@@ -759,9 +755,6 @@ const scannerDialogVisible = ref(false)
 // 顶部扫码入库面板 (Track 身份证自动填充物料+序列号+订单号)
 const trackScanVisible = ref(false)
 
-// 库位级联选择器数据
-const warehouseOptions = ref<any[]>([])
-
 // ================= 第一步：声明基础数据 =================
 
 // [核心优化] 所有列定义
@@ -1208,18 +1201,6 @@ const buildCategoryTree = (categories: string[]) => {
   return root;
 };
 
-// 加载库位树数据
-const loadWarehouseTree = async () => {
-  try {
-    const res = await getWarehouseTree()
-    if (res.code === 200) {
-      warehouseOptions.value = res.data || []
-    }
-  } catch (e) {
-    console.error('加载库位树失败', e)
-  }
-}
-
 const resetQuery = () => {
   queryParams.keyword = ''
   queryParams.searchField = 'all'
@@ -1532,7 +1513,6 @@ onMounted(() => {
   initColumnPermissions()
   fetchData()
   fetchOptions()
-  loadWarehouseTree()
 })
 
 // 成本计算监听
diff --git a/inventory-web/src/views/stock/inbound/semi.vue b/inventory-web/src/views/stock/inbound/semi.vue
index 4bc46e3..44469d8 100644
--- a/inventory-web/src/views/stock/inbound/semi.vue
+++ b/inventory-web/src/views/stock/inbound/semi.vue
@@ -393,10 +393,7 @@
                 <el-col :span="6"><el-form-item label="编码/SKU" prop="sku"><el-input v-model="form.sku" placeholder="系统自动生成" disabled/></el-form-item></el-col>
                 <el-col :span="6"><el-form-item label="入库日期" prop="in_date"><el-date-picker v-model="form.in_date" type="date" value-format="YYYY-MM-DD" style="width:100%" disabled/></el-form-item></el-col>
                 <el-col :span="6"><el-form-item label="库位" prop="warehouse_location">
-                  <WarehouseSelector
-                    v-model="form.warehouse_location"
-                    :options="warehouseOptions"
-                  />
+                  <WarehouseSelector v-model="form.warehouse_location" />
                 </el-form-item></el-col>
               </el-row>
 
@@ -664,7 +661,6 @@ import WarehouseSelector from '@/components/WarehouseSelector.vue'
 import SmartScannerDialog from '@/components/SmartScannerDialog.vue'
 import TrackScanDialog from '@/components/TrackScanDialog.vue'
 import {getLabelPreview, executePrint} from '@/api/common/print'
-import { getWarehouseTree } from '@/api/common/warehouse'
 import { usePasteUpload } from '@/hooks/usePasteUpload'
 import { useUserStore } from '@/stores/user'
 
@@ -826,9 +822,6 @@ const scannerDialogVisible = ref(false)
 // 顶部扫码入库面板 (Track 身份证自动填充物料+序列号)
 const trackScanVisible = ref(false)
 
-// 库位级联选择器数据
-const warehouseOptions = ref<any[]>([])
-
 const entryMode = ref('batch')
 const modeLocked = ref(false)
 
@@ -1312,17 +1305,6 @@ const buildCategoryTree = (categories: string[]) => {
   return root;
 };
 
-// 加载库位树数据
-const loadWarehouseTree = async () => {
-  try {
-    const res = await getWarehouseTree()
-    if (res.code === 200) {
-      warehouseOptions.value = res.data || []
-    }
-  } catch (e) {
-    console.error('加载库位树失败', e)
-  }
-}
 
 const resetQuery = () => {
   queryParams.keyword = ''
@@ -1649,7 +1631,6 @@ onMounted(() => {
   initColumnPermissions()
   fetchData()
   fetchOptions()
-  loadWarehouseTree()
 })
 </script>