diff --git a/backend/src/modules/admin/admin.controller.ts b/backend/src/modules/admin/admin.controller.ts
index c7540a4..0100a51 100644
--- a/backend/src/modules/admin/admin.controller.ts
+++ b/backend/src/modules/admin/admin.controller.ts
@@ -85,7 +85,12 @@ export class AdminController {
       filter.$or = [
         { phone: { $regex: escaped, $options: 'i' } },
         { nickname: { $regex: escaped, $options: 'i' } },
+        { email: { $regex: escaped, $options: 'i' } },
       ]
+      // 支持按 MongoDB _id 搜索（24位 hex）
+      if (/^[0-9a-f]{24}$/i.test(keyword)) {
+        filter.$or.push({ _id: keyword })
+      }
     }
     const skip = (Math.max(1, +page) - 1) * +limit
     const [users, total] = await Promise.all([
diff --git a/zhiyin-app/src/pages/admin/admin.vue b/zhiyin-app/src/pages/admin/admin.vue
index 1530f37..3e41feb 100644
--- a/zhiyin-app/src/pages/admin/admin.vue
+++ b/zhiyin-app/src/pages/admin/admin.vue
@@ -73,7 +73,7 @@
       <!-- 用户 -->
       <view v-if="tab === 'users'" class="section">
         <view class="search-bar">
-          <input v-model="userKeyword" placeholder="搜索手机号/昵称" class="search-input" @confirm="loadUsers" />
+          <input v-model="userKeyword" placeholder="搜索手机号/邮箱/昵称/ID" class="search-input" @confirm="loadUsers" />
           <button class="search-btn" @click="loadUsers">搜索</button>
         </view>
         <view class="user-list" v-if="!usersLoading">
@@ -87,6 +87,9 @@
             <text class="meta-tag email" v-if="u.email">{{ u.email }}</text>
             <text class="meta-tag" v-if="u.wxOpenid">openid:{{ u.wxOpenid.slice(0,12) }}..</text>
           </view>
+          <view class="user-meta-row">
+            <text class="meta-tag id-tag" @click="copyId(u._id)">ID: {{ u._id }}</text>
+          </view>
           <view class="user-meta-row">
             <text class="meta-tag">引力:{{ u.gravity ?? 0 }}</text>
             <text class="meta-tag">面试:{{ u.interviewCount ?? 0 }}次</text>
@@ -1028,6 +1031,13 @@ const doAdjustCredits = async () => {
   } catch { uni.showToast({ title: '调整失败', icon: 'none' }) }
 }
 
+const copyId = (id) => {
+  uni.setClipboardData({
+    data: id,
+    success: () => uni.showToast({ title: 'ID 已复制', icon: 'success' }),
+  })
+}
+
 onMounted(() => { doVerify() })
 </script>
 
@@ -1162,6 +1172,7 @@ onMounted(() => { doVerify() })
 .meta-tag { font-size: 18rpx; background: #F3F4F6; color: var(--color-text-tertiary); padding: 2rpx 10rpx; border-radius: var(--radius-round); }
 .meta-tag.email { background: #EEF2FF; color: var(--color-primary); }
 .meta-tag.share { background: #FFF7ED; color: #D97706; }
+.meta-tag.id-tag { background: #F5F3FF; color: #7C3AED; font-family: monospace; font-size: 16rpx; }
 .meta-tag.badge-done { background: #ECFDF5; color: #059669; }
 .meta-tag.badge-pend { background: #FEF3C7; color: #D97706; }
 .time-row { display: flex; flex-wrap: wrap; gap: 12rpx; }