diff --git a/backend/api/auth.py b/backend/api/auth.py
index c20093f..c2010f5 100644
--- a/backend/api/auth.py
+++ b/backend/api/auth.py
@@ -151,7 +151,7 @@ async def register(
     
     return TokenResponse(
         access_token=access_token,
-        user=UserResponse(**user.dict())
+        user=await UserService.build_user_response(conn, user)
     )
 
 
@@ -188,22 +188,26 @@ async def login(
     
     return TokenResponse(
         access_token=access_token,
-        user=UserResponse(**user.dict())
+        user=await UserService.build_user_response(conn, user)
     )
 
 
 @auth_router.get("/me", response_model=UserResponse, summary="获取当前用户信息")
-async def get_me(current_user: User = Depends(get_current_user)):
+async def get_me(
+    current_user: User = Depends(get_current_user),
+    conn: asyncpg.Connection = Depends(get_db),
+):
     """
     获取当前登录用户信息
     
     Args:
         current_user: 当前登录用户
+        conn: 数据库连接
     
     Returns:
-        UserResponse: 用户信息
+        UserResponse: 用户信息（含部门名称等）
     """
-    return UserResponse(**current_user.dict())
+    return await UserService.build_user_response(conn, current_user)
 
 
 # ==================== 手机号注册/登录接口 ====================
@@ -297,7 +301,7 @@ async def phone_register(
     
     return TokenResponse(
         access_token=access_token,
-        user=UserResponse(**user.dict())
+        user=await UserService.build_user_response(conn, user)
     )
 
 
@@ -350,7 +354,7 @@ async def phone_login(
     
     return TokenResponse(
         access_token=access_token,
-        user=UserResponse(**user.dict())
+        user=await UserService.build_user_response(conn, user)
     )
 
 
@@ -403,7 +407,7 @@ async def wechat_login(
     
     return TokenResponse(
         access_token=access_token,
-        user=UserResponse(**user.dict())
+        user=await UserService.build_user_response(conn, user)
     )
 
 
diff --git a/backend/models/user.py b/backend/models/user.py
index 8f54cb3..e26a1de 100644
--- a/backend/models/user.py
+++ b/backend/models/user.py
@@ -81,6 +81,15 @@ class UserLogin(BaseModel):
     password: str
 
 
+class UserDepartmentInfo(BaseModel):
+    """用户所属部门信息"""
+    id: int
+    name: str
+    parent_id: Optional[int] = None
+    leader_user_id: Optional[int] = None
+    leader_name: Optional[str] = None
+
+
 class UserResponse(BaseModel):
     """用户响应模型（不包含敏感信息）"""
     id: int
@@ -98,6 +107,8 @@ class UserResponse(BaseModel):
     last_login_at: Optional[datetime] = None
     enterprise_id: Optional[int] = None
     department_id: Optional[int] = None
+    department_name: Optional[str] = None
+    department: Optional[UserDepartmentInfo] = None
     role: str = "employee"
     is_first_login: bool = True
 
diff --git a/backend/services/user_service.py b/backend/services/user_service.py
index 9395fd2..6be672d 100644
--- a/backend/services/user_service.py
+++ b/backend/services/user_service.py
@@ -5,7 +5,8 @@ from datetime import datetime, timezone
 from typing import Optional
 import asyncpg
 
-from models.user import User, UserCreate
+from models.user import User, UserCreate, UserResponse, UserDepartmentInfo
+from services.department_service import DepartmentService
 from core.security import get_password_hash, verify_password
 from logger.logging import get_logger
 
@@ -392,3 +393,28 @@ class UserService:
         )
         return User(**dict(row))
 
+    @staticmethod
+    async def build_user_response(conn: asyncpg.Connection, user: User) -> UserResponse:
+        """构建含部门信息的用户响应"""
+        department = None
+        department_name = None
+        if user.department_id is not None and user.enterprise_id is not None:
+            dept = await DepartmentService.get_by_id(
+                conn, user.department_id, user.enterprise_id
+            )
+            if dept:
+                department_name = dept["name"]
+                department = UserDepartmentInfo(
+                    id=dept["id"],
+                    name=dept["name"],
+                    parent_id=dept.get("parent_id"),
+                    leader_user_id=dept.get("leader_user_id"),
+                    leader_name=dept.get("leader_name"),
+                )
+        data = user.model_dump(exclude={"hashed_password"})
+        return UserResponse(
+            **data,
+            department_name=department_name,
+            department=department,
+        )
+