diff --git a/inventory-backend/app/api/v1/warehouse.py b/inventory-backend/app/api/v1/warehouse.py
index ae94f64..8b24af6 100644
--- a/inventory-backend/app/api/v1/warehouse.py
+++ b/inventory-backend/app/api/v1/warehouse.py
@@ -34,14 +34,36 @@ def build_tree(nodes, parent_id=None):
 def get_tree():
     """
     获取库位树形结构
+
+    查询参数:
+      prefixes —— 可选，逗号分隔的顶层前缀，例如 ?prefixes=Y 或 ?prefixes=C,L
+                  只返回**顶层** name / full_path 命中这些前缀的根节点及其完整子树；
+                  不传则返回全量。
+
+    用途：前端按公司精简拉取（IRIS 只要 Y*，LICA 只要 C*/L*），
+    在**保留完整子树**的前提下减少节点数与传输量 —— 不能退回懒加载，
+    因为 setCheckedKeys / getCheckedNodes 依赖全树已构建。
     """
     try:
+        raw_prefixes = request.args.get('prefixes', '', type=str)
+        prefixes = [p.strip().upper() for p in raw_prefixes.split(',') if p.strip()]
+
         # 查询所有库位，按 name 升序排序
         all_locations = SysWarehouseLocation.query.order_by(SysWarehouseLocation.name.asc()).all()
 
         # 构建树形结构（O(N) 内存组装，见 build_tree）
         tree_data = build_tree(all_locations, parent_id=None)
 
+        # ★ 只在**顶层**做前缀过滤：命中即整棵子树保留，不递归裁剪，
+        #   避免把子树打散导致前端勾选语义错乱
+        if prefixes:
+            def _hit(node):
+                name = str(node.get('name') or '').upper()
+                path = str(node.get('full_path') or '').upper()
+                return any(name.startswith(p) or path.startswith(p) for p in prefixes)
+
+            tree_data = [n for n in tree_data if _hit(n)]
+
         return jsonify({
             'code': 200,
             'msg': 'success',
diff --git a/inventory-web/src/api/common/warehouse.ts b/inventory-web/src/api/common/warehouse.ts
index c3685bc..2c6f0b3 100644
--- a/inventory-web/src/api/common/warehouse.ts
+++ b/inventory-web/src/api/common/warehouse.ts
@@ -1,10 +1,13 @@
 import request from '@/utils/request'
 
 // 获取库位树形结构
-export function getWarehouseTree() {
+// prefixes 可选：只返回顶层命中这些前缀的根节点及其完整子树（后端过滤），
+// 用于按公司精简拉取（IRIS 传 ['Y']，LICA 传 ['C','L']）；不传则全量
+export function getWarehouseTree(prefixes?: string[]) {
   return request({
     url: '/v1/warehouse/tree',
-    method: 'get'
+    method: 'get',
+    params: prefixes && prefixes.length ? { prefixes: prefixes.join(',') } : undefined
   })
 }
 
diff --git a/inventory-web/src/views/stock/stocktake/index.vue b/inventory-web/src/views/stock/stocktake/index.vue
index 809c20a..fac26a3 100644
--- a/inventory-web/src/views/stock/stocktake/index.vue
+++ b/inventory-web/src/views/stock/stocktake/index.vue
@@ -791,22 +791,16 @@ const showCreateForm = computed(() =>
 // 抽盘配置区是左右双栏，400px 的窄容器装不下，此时把欢迎页放宽
 const idleWide = computed(() => showCreateForm.value && newScopeType.value === 'active')
 
-// 库位树按公司前缀过滤（IRIS 只看 Y，LICA 看 C/L；未配置的公司不过滤）
-const filterTreeByCompany = (nodes: any[], company: string) => {
-  const prefixes = getAllowedLocPrefixes(company)
-  if (!prefixes.length) return nodes
-  return nodes.filter((n: any) =>
-      prefixes.some((p: string) => String(n?.name || '').toUpperCase().startsWith(p.toUpperCase()))
-  )
-}
-
 const loadLocationTree = async () => {
   if (locTreeData.value.length) return
   treeLoading.value = true
   try {
-    const res: any = await getWarehouseTree()
-    const raw = res?.data || []
-    locTreeData.value = filterTreeByCompany(raw, selectedCompany.value)
+    // ★ 按公司前缀**后端过滤**顶层节点（子树完整保留）：IRIS 只拉 Y*，
+    //   LICA 只拉 C*/L*，显著减少节点数与传输量。
+    //   注意不能改成懒加载 —— setCheckedKeys / getCheckedNodes 依赖全树已构建。
+    const prefixes = getAllowedLocPrefixes(selectedCompany.value)
+    const res: any = await getWarehouseTree(prefixes)
+    locTreeData.value = res?.data || []
   } catch (e) {
     console.error('获取库位树失败', e)
     ElMessage.error('获取库位树失败')
@@ -837,16 +831,21 @@ const fetchRecommendLocations = async () => {
   }
   recLoading.value = true
   try {
-    // 先把树准备好，否则 setCheckedKeys 对尚未渲染的节点无效
-    await loadLocationTree()
+    // ★ 树与推荐**并行**：两者互不依赖，串行会把两段网络等待直接叠加。
+    //   loadLocationTree 内部有「已加载则短路返回」，重复调用无额外开销。
+    const [, res] = await Promise.all([
+      loadLocationTree(),
+      request({
+        url: '/v1/inbound/stock/stocktake/recommend-locations',
+        method: 'get',
+        params: withCompany({ days: recommendDays.value, top_n: recTopN.value })
+      })
+    ])
+
+    // 等树渲染完再勾选，否则 setCheckedKeys 对尚未渲染的节点无效
     await nextTick()
 
-    const res: any = await request({
-      url: '/v1/inbound/stock/stocktake/recommend-locations',
-      method: 'get',
-      params: withCompany({ days: recommendDays.value, top_n: recTopN.value })
-    })
-    const locs: string[] = res?.data?.locations || []
+    const locs: string[] = (res as any)?.data?.locations || []
     if (!locs.length) {
       ElMessage.warning(`最近 ${recommendDays.value} 天没有找到活跃库位`)
       return
@@ -858,9 +857,12 @@ const fetchRecommendLocations = async () => {
     syncSelectedPaths()
 
     // 推荐里有、但树上勾不到的（不在当前公司前缀范围内等）要如实告知，
-    // 否则这些库位会静默落选 —— 工人以为盘到了，其实没进范围
-    const checkedPaths = new Set(selectedLocationPaths.value)
-    const missing = locs.filter(l => !checkedPaths.has(l))
+    // 否则这些库位会静默落选 —— 工人以为盘到了，其实没进范围。
+    // ★ 注意不能逐字比对：右侧只存**末级**路径，而推荐返回的是库存级路径，
+    //   可能是非末级（勾它会级联勾中其子节点），故需按「自身或其祖先」判定覆盖。
+    const isCovered = (rec: string) =>
+        selectedLocationPaths.value.some(p => p === rec || p.startsWith(rec + '/'))
+    const missing = locs.filter(l => !isCovered(l))
     if (missing.length) {
       ElMessage.warning(`推荐中 ${missing.length} 个库位不在当前公司的库位树上，未能勾选`)
       console.warn('未能勾选的推荐库位:', missing)