diff --git a/backend/app/api/users.py b/backend/app/api/users.py
index 623a085..6b72707 100644
--- a/backend/app/api/users.py
+++ b/backend/app/api/users.py
@@ -5,6 +5,7 @@ from fastapi import APIRouter, HTTPException, Request, Depends
 from pydantic import BaseModel
 from typing import List, Optional
 from app.user_manager import user_manager, User
+from app.user_password import password_manager
 
 router = APIRouter(prefix="/users", tags=["用户管理"])
 
@@ -29,6 +30,11 @@ class SetAdminRequest(BaseModel):
     is_admin: bool
 
 
+class ResetPasswordRequest(BaseModel):
+    user_id: str
+    new_password: Optional[str] = None  # 如果为空则使用默认密码
+
+
 @router.get("/current")
 async def get_current_user(user: User = Depends(require_login)):
     """获取当前登录用户信息"""
@@ -122,4 +128,62 @@ async def get_user(
     if not user:
         raise HTTPException(status_code=404, detail="用户不存在")
     
-    return user.dict()
\ No newline at end of file
+    return user.dict()
+
+
+@router.post("/reset-password")
+async def reset_user_password(
+    data: ResetPasswordRequest,
+    admin_user: User = Depends(require_admin)
+):
+    """
+    重置用户密码（仅管理员）
+    
+    如果提供了 new_password，则设置为指定密码
+    如果未提供 new_password，则重置为默认密码（username@666）
+    
+    限制：
+    - 不能重置自己的密码（应该使用修改密码功能）
+    """
+    # 检查是否尝试重置自己的密码
+    if data.user_id == admin_user.user_id:
+        raise HTTPException(
+            status_code=400,
+            detail="不能重置自己的密码，请使用修改密码功能"
+        )
+    
+    # 检查目标用户是否存在
+    target_user = await user_manager.get_user(data.user_id)
+    if not target_user:
+        raise HTTPException(
+            status_code=404,
+            detail="目标用户不存在"
+        )
+    
+    # 重置密码
+    try:
+        actual_password = await password_manager.set_password(
+            target_user.user_id,
+            target_user.username,
+            data.new_password
+        )
+        
+        # 如果使用了默认密码，返回密码供管理员告知用户
+        message = "密码重置成功"
+        response_data = {
+            "message": message,
+            "user_id": data.user_id,
+            "username": target_user.username
+        }
+        
+        if not data.new_password:
+            response_data["default_password"] = actual_password
+            response_data["message"] = f"密码已重置为默认密码: {actual_password}"
+        
+        return response_data
+        
+    except Exception as e:
+        raise HTTPException(
+            status_code=500,
+            detail=f"重置密码失败: {str(e)}"
+        )
\ No newline at end of file
diff --git a/backend/app/main.py b/backend/app/main.py
index 589b685..8c97c05 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -27,7 +27,23 @@ logger = get_logger(__name__)
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     """应用生命周期管理"""
-    logger.info("应用启动，等待用户登录...")
+    logger.info("应用启动，初始化数据库表结构...")
+    
+    # 在应用启动时初始化数据库表结构
+    try:
+        from app.database import get_engine, Base
+        
+        # 使用全局引擎创建所有表
+        engine = await get_engine("_global_init_")
+        async with engine.begin() as conn:
+            await conn.run_sync(Base.metadata.create_all)
+        
+        logger.info("✅ 数据库表结构初始化成功")
+    except Exception as e:
+        logger.error(f"❌ 数据库表结构初始化失败: {str(e)}", exc_info=True)
+        # 不阻止应用启动，允许在后续操作中重试
+    
+    logger.info("应用启动完成，等待用户登录...")
     
     yield
     
diff --git a/frontend/src/components/UserMenu.tsx b/frontend/src/components/UserMenu.tsx
index d88e763..05891ec 100644
--- a/frontend/src/components/UserMenu.tsx
+++ b/frontend/src/components/UserMenu.tsx
@@ -1,6 +1,6 @@
 import { useState, useEffect } from 'react';
 import { Dropdown, Avatar, Space, Typography, message, Modal, Table, Button, Tag, Popconfirm, Pagination, Form, Input } from 'antd';
-import { UserOutlined, LogoutOutlined, TeamOutlined, CrownOutlined, LockOutlined } from '@ant-design/icons';
+import { UserOutlined, LogoutOutlined, TeamOutlined, CrownOutlined, LockOutlined, KeyOutlined } from '@ant-design/icons';
 import { authApi, userApi } from '../services/api';
 import type { User } from '../types';
 import type { MenuProps } from 'antd';
@@ -87,6 +87,55 @@ export default function UserMenu() {
     }
   };
 
+  const handleResetPassword = async (userId: string, username: string) => {
+    Modal.confirm({
+      title: '重置用户密码',
+      content: (
+        <div>
+          <p>确定要重置用户 <strong>{username}</strong> 的密码吗？</p>
+          <p style={{ color: '#8c8c8c', fontSize: 12 }}>密码将被重置为默认密码：<strong>{username}@666</strong></p>
+        </div>
+      ),
+      okText: '确定重置',
+      cancelText: '取消',
+      onOk: async () => {
+        try {
+          const result = await userApi.resetPassword(userId);
+          if (result.default_password) {
+            Modal.success({
+              title: '密码重置成功',
+              content: (
+                <div>
+                  <p>用户 <strong>{result.username}</strong> 的密码已重置为：</p>
+                  <p style={{
+                    padding: '8px 12px',
+                    background: '#f5f5f5',
+                    borderRadius: 4,
+                    fontSize: 16,
+                    fontFamily: 'monospace',
+                    color: '#1890ff',
+                    fontWeight: 'bold'
+                  }}>
+                    {result.default_password}
+                  </p>
+                  <p style={{ color: '#ff4d4f', fontSize: 12, marginTop: 8 }}>
+                    请将此密码告知用户，建议用户登录后立即修改密码
+                  </p>
+                </div>
+              ),
+            });
+          } else {
+            message.success('密码重置成功');
+          }
+          loadUsers();
+        } catch (error: any) {
+          console.error('重置密码失败:', error);
+          message.error(error.response?.data?.detail || '重置密码失败');
+        }
+      },
+    });
+  };
+
   const handleChangePassword = async (values: { oldPassword: string; newPassword: string }) => {
     try {
       setChangingPassword(true);
@@ -186,11 +235,11 @@ export default function UserMenu() {
     {
       title: '操作',
       key: 'actions',
-      width: 200,
+      width: 280,
       render: (_: unknown, record: User) => {
         const isSelf = record.user_id === currentUser?.user_id;
         return (
-          <Space>
+          <Space size="small">
             {record.is_admin ? (
               <Popconfirm
                 title="确定要取消管理员权限吗？"
@@ -210,6 +259,15 @@ export default function UserMenu() {
                 设为管理员
               </Button>
             )}
+            <Button
+              size="small"
+              icon={<KeyOutlined />}
+              onClick={() => handleResetPassword(record.user_id, record.username)}
+              disabled={isSelf}
+              title={isSelf ? '不能重置自己的密码' : '重置为默认密码'}
+            >
+              重置密码
+            </Button>
             <Popconfirm
               title="确定要删除该用户吗？此操作不可恢复！"
               onConfirm={() => handleDeleteUser(record.user_id)}
diff --git a/frontend/src/services/api.ts b/frontend/src/services/api.ts
index 7b7b527..ffeba23 100644
--- a/frontend/src/services/api.ts
+++ b/frontend/src/services/api.ts
@@ -156,6 +156,14 @@ export const userApi = {
   deleteUser: (userId: string) => api.delete(`/users/${userId}`),
   
   getUser: (userId: string) => api.get<unknown, User>(`/users/${userId}`),
+  
+  resetPassword: (userId: string, newPassword?: string) =>
+    api.post<unknown, {
+      message: string;
+      user_id: string;
+      username: string;
+      default_password?: string;
+    }>('/users/reset-password', { user_id: userId, new_password: newPassword }),
 };
 
 export const settingsApi = {