diff --git a/backend/app/api/auth.py b/backend/app/api/auth.py
index 8b82b27..d94e46a 100644
--- a/backend/app/api/auth.py
+++ b/backend/app/api/auth.py
@@ -25,15 +25,14 @@ class RegisterResponse(BaseModel):
 async def register(req: RegisterRequest, db: AsyncSession = Depends(get_db)):
     account = req.account.strip().lower()
     result = await db.execute(select(User).where(User.email == account))
-    if result.scalar_one_or_none():
-        raise HTTPException(status_code=400, detail="账号已注册")
-    user = User(
-        email=account, password_hash=hash_password(req.password),
-        nickname=req.nickname, status="pending", group_id=req.group_id,
-    )
-    db.add(user)
-    await db.commit()
-    return RegisterResponse(message="注册成功，等待管理员审批")
+    if not result.scalar_one_or_none():
+        user = User(
+            email=account, password_hash=hash_password(req.password),
+            nickname=req.nickname, status="pending", group_id=req.group_id,
+        )
+        db.add(user)
+        await db.commit()
+    return RegisterResponse(message="注册请求已提交，等待管理员审批")
 
 
 @router.post("/login", response_model=TokenResponse)
@@ -92,7 +91,7 @@ async def refresh(req: RefreshRequest, db: AsyncSession = Depends(get_db)):
     result = await db.execute(select(User).where(User.id == user_id))
     user = result.scalar_one_or_none()
     if not user:
-        raise HTTPException(status_code=401, detail="User not found")
+        raise HTTPException(status_code=401, detail="Token 无效")
     if user.status == "pending":
         raise HTTPException(status_code=403, detail="账户正在等待管理员审批")
     if user.status == "disabled":