diff --git a/study-project-backend/src/main/java/com/example/controller/UserController.java b/study-project-backend/src/main/java/com/example/controller/UserController.java
index fafaf1d..cdb710e 100644
--- a/study-project-backend/src/main/java/com/example/controller/UserController.java
+++ b/study-project-backend/src/main/java/com/example/controller/UserController.java
@@ -20,10 +20,13 @@ public class UserController {
     }
 
     @PostMapping("/save-info")
-    public RestBean<Void> saveInfo(@RequestBody AccountInfo info,
+    public RestBean<String> saveInfo(@RequestBody AccountInfo info,
                                    @SessionAttribute("account") AccountUser user){
         info.setUid(user.getId());
-        service.saveUserInfo(info);
-        return RestBean.success();
+        if(service.saveUserInfo(info)) {
+            return RestBean.success();
+        } else {
+            return RestBean.failure(400, "用户名称已被其他用户使用，无法修改");
+        }
     }
 }
diff --git a/study-project-backend/src/main/java/com/example/mapper/UserMapper.java b/study-project-backend/src/main/java/com/example/mapper/UserMapper.java
index 09026c7..9f27b79 100644
--- a/study-project-backend/src/main/java/com/example/mapper/UserMapper.java
+++ b/study-project-backend/src/main/java/com/example/mapper/UserMapper.java
@@ -29,4 +29,7 @@ public interface UserMapper {
              qq=#{qq}, wx=#{wx}, blog=#{blog}, `desc`=#{desc}
             """)
     void saveInfo(AccountInfo info);
+
+    @Update("update db_account set username=#{name} where id=#{uid}")
+    void updateUsername(String name, int uid);
 }
diff --git a/study-project-backend/src/main/java/com/example/service/UserService.java b/study-project-backend/src/main/java/com/example/service/UserService.java
index 823ca6b..86e241e 100644
--- a/study-project-backend/src/main/java/com/example/service/UserService.java
+++ b/study-project-backend/src/main/java/com/example/service/UserService.java
@@ -3,5 +3,5 @@ package com.example.service;
 import com.example.entity.user.AccountInfo;
 
 public interface UserService {
-    void saveUserInfo(AccountInfo info);
+    boolean saveUserInfo(AccountInfo info);
 }
diff --git a/study-project-backend/src/main/java/com/example/service/impl/UserServiceImpl.java b/study-project-backend/src/main/java/com/example/service/impl/UserServiceImpl.java
index 4d38b90..f89ee13 100644
--- a/study-project-backend/src/main/java/com/example/service/impl/UserServiceImpl.java
+++ b/study-project-backend/src/main/java/com/example/service/impl/UserServiceImpl.java
@@ -1,5 +1,6 @@
 package com.example.service.impl;
 
+import com.example.entity.auth.Account;
 import com.example.entity.user.AccountInfo;
 import com.example.mapper.UserMapper;
 import com.example.service.UserService;
@@ -12,7 +13,14 @@ public class UserServiceImpl implements UserService {
     UserMapper mapper;
 
     @Override
-    public void saveUserInfo(AccountInfo info) {
+    public boolean saveUserInfo(AccountInfo info) {
+        Account account = mapper.findAccountByNameOrEmail(info.getUsername());
+        if(account == null) {
+            mapper.updateUsername(info.getUsername(), info.getUid());
+        } else if(account.getId() != info.getUid()){
+            return false;
+        }
         mapper.saveInfo(info);
+        return true;
     }
 }
diff --git a/study-project-frontend/src/net/index.js b/study-project-frontend/src/net/index.js
index 01a2ecf..7dc9327 100644
--- a/study-project-frontend/src/net/index.js
+++ b/study-project-frontend/src/net/index.js
@@ -1,6 +1,9 @@
 import axios from "axios";
 import {ElMessage} from "element-plus";
 import router from "@/router";
+import {useStore} from "@/stores";
+
+const store = useStore()
 
 const defaultError = () => ElMessage.error('发生了一些错误，请联系管理员')
 const defaultFailure = (message) => ElMessage.warning(message)
@@ -12,9 +15,11 @@ function post(url, data, success, type = 'x-www-form-urlencoded', failure = defa
         },
         withCredentials: true
     }).then(({data}) => {
-        if(data.status === 401)
+        if(data.status === 401) {
+            localStorage.removeItem('user')
+            store.auth.user = undefined
             router.push('/')
-        else if(data.success)
+        } else if(data.success)
             success(data.message, data.status)
         else
             failure(data.message, data.status)
@@ -25,9 +30,11 @@ function get(url, success, failure = defaultFailure, error = defaultError) {
     axios.get(url, {
         withCredentials: true
     }).then(({data}) => {
-        if(data.status === 401)
+        if(data.status === 401) {
+            localStorage.removeItem('user')
+            store.auth.user = undefined
             router.push('/')
-        else if(data.success)
+        } else if(data.success)
             success(data.message, data.status)
         else
             failure(data.message, data.status)