diff --git a/pom.xml b/pom.xml
index df911c3..531b24c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -123,6 +123,10 @@
             <version>4.0.0</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/src/main/java/top/suyiiyii/sims/controller/UserController.java b/src/main/java/top/suyiiyii/sims/controller/UserController.java
index 7ece1a7..d52b86f 100644
--- a/src/main/java/top/suyiiyii/sims/controller/UserController.java
+++ b/src/main/java/top/suyiiyii/sims/controller/UserController.java
@@ -1,10 +1,15 @@
 package top.suyiiyii.sims.controller;
 
 import cn.hutool.core.util.StrUtil;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import io.swagger.v3.oas.annotations.Operation;
 import jakarta.servlet.http.HttpServletRequest;
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.Email;
 import lombok.Data;
 import lombok.extern.slf4j.Slf4j;
+import org.hibernate.validator.constraints.Length;
+import org.hibernate.validator.constraints.Range;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 import top.suyiiyii.sims.common.AuthAccess;
@@ -12,7 +17,9 @@ import top.suyiiyii.sims.common.JwtInterceptor;
 import top.suyiiyii.sims.common.Result;
 import top.suyiiyii.sims.dto.CommonResponse;
 import top.suyiiyii.sims.dto.UserDto;
+import top.suyiiyii.sims.entity.User;
 import top.suyiiyii.sims.exception.ServiceException;
+import top.suyiiyii.sims.mapper.MpUserMapper;
 import top.suyiiyii.sims.service.RoleService;
 import top.suyiiyii.sims.service.UserService;
 
@@ -35,12 +42,14 @@ public class UserController {
     @Autowired
     UserService userService;
     @Autowired
+    MpUserMapper mpUserMapper;
+    @Autowired
     RoleService roleService;
 
 
     @AuthAccess(allowRoles = {"guest"})
     @PostMapping("/user/login")
-    public Result<LoginResponse> login(@RequestBody LoginRequest request, HttpServletRequest httpServletRequest) {
+    public Result<LoginResponse> login(@RequestBody LoginRequest request) {
         log.info("login request:{}", request);
 
         if (StrUtil.isBlank(request.getUsername()) || StrUtil.isBlank(request.getPassword())) {
@@ -58,14 +67,20 @@ public class UserController {
 
     @AuthAccess(allowRoles = {"guest"})
     @PostMapping("/user/register")
-    public Result<CommonResponse> register(@RequestBody RegisterRequest request) {
+    public Result<CommonResponse> register(@RequestBody @Valid
+                                           RegisterRequest request) {
         log.info("register request:{}", request);
-        if (StrUtil.isBlank(request.getUsername()) || StrUtil.isBlank(request.getPassword())) {
-
-            return Result.error("用户名或密码不能为空");
+        // 检查 username 是否已存在
+        if (mpUserMapper.selectOne(new LambdaQueryWrapper<User>(User.class).eq(User::getUsername, request.getUsername())) != null) {
+            throw new ServiceException("用户名已存在");
         }
-        if (request.getPassword() == null || request.getPassword().length() < 3) {
-            throw new ServiceException("密码长度不能小于3位");
+        // 检查 studentId 是否已存在
+        if (mpUserMapper.selectOne(new LambdaQueryWrapper<User>(User.class).eq(User::getStudentId, request.getStudentId())) != null) {
+            throw new ServiceException("学号已存在");
+        }
+        // 检查 email 是否已存在
+        if (mpUserMapper.selectOne(new LambdaQueryWrapper<User>(User.class).eq(User::getEmail, request.getEmail())) != null) {
+            throw new ServiceException("邮箱已存在");
         }
         userService.register(request);
 
@@ -110,11 +125,17 @@ public class UserController {
 
     @Data
     public static class RegisterRequest {
+        @Length(min = 3, max = 20)
         private String username;
+        @Length(min = 6, max = 20)
         private String password;
+        @Range(min = 1, max = 1000000000)
         private Integer studentId;
+        @Email
         private String email;
+        @Length(min = 1, max = 20)
         private String grade;
+        @Length(min = 1, max = 20)
         private String userGroup;
     }
 
diff --git a/src/main/java/top/suyiiyii/sims/entity/User.java b/src/main/java/top/suyiiyii/sims/entity/User.java
index 7fadf55..9c41bfb 100644
--- a/src/main/java/top/suyiiyii/sims/entity/User.java
+++ b/src/main/java/top/suyiiyii/sims/entity/User.java
@@ -35,10 +35,8 @@ public class User {
     @UniqueIndex
     @Column(comment = "邮箱", notNull = true)
     private String email;
-    @UniqueIndex
     @Column(comment = "年级", notNull = true)
     private String grade;
-    @UniqueIndex
     @Column(comment = "用户所属团队", notNull = true)
     private String userGroup;
 }
diff --git a/src/main/java/top/suyiiyii/sims/service/UserService.java b/src/main/java/top/suyiiyii/sims/service/UserService.java
index e63a278..884c6a0 100644
--- a/src/main/java/top/suyiiyii/sims/service/UserService.java
+++ b/src/main/java/top/suyiiyii/sims/service/UserService.java
@@ -78,25 +78,9 @@ public class UserService {
     public void register(UserController.RegisterRequest req) {
 
         User dbUser = userMapper.selectByUserId(req.getStudentId());
-
-        if (req.getUsername() == null || req.getUsername().equals("")) {
-            throw new ServiceException("用户名不能为空");
-        }
         if (dbUser != null) {
             throw new ServiceException("账号已经存在");
         }
-        if (req.getStudentId() == null || req.getStudentId().equals("")) {
-            throw new ServiceException("学号不能为空");
-        }
-        if (req.getPassword() == null || req.getPassword().equals("")) {
-            throw new ServiceException("密码不能为空");
-        }
-        if (req.getEmail() == null || req.getEmail().equals("")) {
-            throw new ServiceException("邮箱不能为空");
-        }
-        if (req.getUserGroup() == null || req.getUserGroup().equals("")) {
-            throw new ServiceException("组别不能为空");
-        }
         User user = modelMapper.map(req, User.class);
 
         mpUserMapper.insert(user);