diff --git a/backend/app/core/security.py b/backend/app/core/security.py
index be5ce5a..56de4e9 100644
--- a/backend/app/core/security.py
+++ b/backend/app/core/security.py
@@ -1,20 +1,19 @@
+import bcrypt
+
 from datetime import datetime, timedelta, timezone
 from typing import Any
 
 from jose import jwt
-from passlib.context import CryptContext
 
 from app.core.config import settings
 
-pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
-
 
 def verify_password(plain_password: str, hashed_password: str) -> bool:
-    return pwd_context.verify(plain_password, hashed_password)
+    return bcrypt.checkpw(plain_password.encode("utf-8"), hashed_password.encode("utf-8"))
 
 
 def get_password_hash(password: str) -> str:
-    return pwd_context.hash(password)
+    return bcrypt.hashpw(password.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")
 
 
 def create_access_token(subject: str, expires_delta: timedelta | None = None) -> str:
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 8098fe9..8040059 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -6,7 +6,6 @@ alembic==1.14.0
 pydantic==2.10.3
 pydantic-settings==2.6.1
 python-jose[cryptography]==3.3.0
-passlib[bcrypt]==1.7.4
 bcrypt==4.2.1
 python-multipart==0.0.20
 httpx==0.28.1
diff --git a/frontend/src/pages/LoginPage.tsx b/frontend/src/pages/LoginPage.tsx
index 379256a..bdfb58f 100644
--- a/frontend/src/pages/LoginPage.tsx
+++ b/frontend/src/pages/LoginPage.tsx
@@ -1,8 +1,18 @@
 import { LockOutlined, UserOutlined } from '@ant-design/icons'
 import { Button, Card, Form, Input, Tabs, Typography, message } from 'antd'
+import axios from 'axios'
 import { Navigate, useNavigate } from 'react-router-dom'
 import { useAuth } from '../context/AuthContext'
 
+function apiErrorMessage(error: unknown, fallback: string) {
+  if (axios.isAxiosError(error)) {
+    const detail = error.response?.data?.detail
+    if (typeof detail === 'string') return detail
+    if (Array.isArray(detail) && detail[0]?.msg) return detail[0].msg
+  }
+  return fallback
+}
+
 export default function LoginPage() {
   const { user, login, register, loading } = useAuth()
   const navigate = useNavigate()
@@ -16,8 +26,8 @@ export default function LoginPage() {
       await login(values.username, values.password)
       message.success('登录成功')
       navigate('/')
-    } catch {
-      message.error('用户名或密码错误')
+    } catch (error) {
+      message.error(apiErrorMessage(error, '用户名或密码错误'))
     }
   }
 
@@ -30,8 +40,8 @@ export default function LoginPage() {
       await register(values.username, values.password)
       message.success('注册成功')
       navigate('/')
-    } catch {
-      message.error('注册失败，用户名可能已存在')
+    } catch (error) {
+      message.error(apiErrorMessage(error, '注册失败，请稍后重试'))
     }
   }