diff --git a/src/modules/user/UserFormDialog.vue b/src/modules/user/UserFormDialog.vue
index 84fd853..3bb1420 100644
--- a/src/modules/user/UserFormDialog.vue
+++ b/src/modules/user/UserFormDialog.vue
@@ -13,7 +13,7 @@
  *   password        密码 (新建必填, 修改可选-留空表示不修改)
  *   sex             性别 0男1女 (选填)
  *   enabled         禁用标识 0正常1禁用 (选填, 默认正常)
- *   enterpriseId    关联企业 (单选, 取 tb_user.enterpriseId; 真多对多需后端加 user_enterprise_bind 表, 当前未做)
+ *   enterpriseIds   关联企业 (多选, 一人可属多个企业; 后端维护 tb_supplier_enterprise 绑定表, C端可切换企业身份)
  *
  * 已去掉:
  *   - header (头像 URL): 改用默认头像, 此处无意义
@@ -29,7 +29,7 @@ interface UserForm {
   mobile: string
   password: string
   sex: '' | '0' | '1'
-  enterpriseId: number | null
+  enterpriseIds: number[]
   enabled: '' | '0' | '1'
 }
 
@@ -58,7 +58,7 @@ const form = reactive<UserForm>({
   mobile: '',
   password: '',
   sex: '',
-  enterpriseId: null,
+  enterpriseIds: [],
   enabled: '0',
 })
 
@@ -108,7 +108,7 @@ function resetForm() {
   form.mobile = ''
   form.password = ''
   form.sex = ''
-  form.enterpriseId = null
+  form.enterpriseIds = []
   form.enabled = '0'
 }
 
@@ -155,7 +155,11 @@ async function loadDetail() {
       form.mobile = data.mobile || ''
       form.password = ''
       form.sex = (data.sex === 0 || data.sex === 1 ? String(data.sex) : '') as UserForm['sex']
-      form.enterpriseId = data.enterpriseId ? Number(data.enterpriseId) : null
+      // 多企业关联回显: 后端 getUserInfo 返回 enterpriseIdList; 兼容旧数据单值 enterpriseId
+      const ids = Array.isArray(data.enterpriseIdList)
+        ? data.enterpriseIdList.map((v: any) => Number(v)).filter((v: any) => Number.isFinite(v) && v > 0)
+        : (data.enterpriseId ? [Number(data.enterpriseId)] : [])
+      form.enterpriseIds = ids
       form.enabled = (data.enabled === 0 || data.enabled === 1 ? String(data.enabled) : '0') as UserForm['enabled']
     }
     await nextTick()
@@ -187,7 +191,7 @@ async function submit() {
     }
     if (form.password) payload.password = form.password
     if (form.sex !== '') payload.sex = Number(form.sex)
-    if (form.enterpriseId) payload.enterpriseId = Number(form.enterpriseId)
+    if (form.enterpriseIds.length) payload.enterpriseIds = form.enterpriseIds
     if (form.enabled !== '') payload.enabled = Number(form.enabled)
 
     if (mode.value === 'create') {
@@ -259,12 +263,13 @@ async function submit() {
           </el-radio-group>
         </el-form-item>
 
-        <el-form-item label="关联企业">
+        <el-form-item label="关联企业" prop="enterpriseIds">
           <el-select
-            v-model="form.enterpriseId"
-            placeholder="请选择关联企业 (可选)"
-            clearable
+            v-model="form.enterpriseIds"
+            placeholder="请选择关联企业 (可多选, 一人可属多个企业)"
+            multiple
             filterable
+            clearable
             :loading="enterpriseLoading"
             style="width: 100%"
           >