diff --git a/src/test/frontend/components/FriendsPageWithAPI.tsx b/src/test/frontend/components/FriendsPageWithAPI.tsx
index 3bf494bf..b337235d 100644
--- a/src/test/frontend/components/FriendsPageWithAPI.tsx
+++ b/src/test/frontend/components/FriendsPageWithAPI.tsx
@@ -301,7 +301,9 @@ export const FriendsPageWithAPI: React.FC<FriendsPageProps> = ({
       setEmailSearch('');
     } catch (error) {
       console.error('发送好友请求失败:', error);
-      alert('发送失败，请稍后重试');
+      // 显示后端返回的具体错误消息
+      const errorMessage = error instanceof Error ? error.message : '发送失败，请稍后重试';
+      alert(errorMessage);
     }
   };
 
diff --git a/src/test/frontend/components/FriendsPageWithRealAPI.tsx b/src/test/frontend/components/FriendsPageWithRealAPI.tsx
index 34a67032..e97134bc 100644
--- a/src/test/frontend/components/FriendsPageWithRealAPI.tsx
+++ b/src/test/frontend/components/FriendsPageWithRealAPI.tsx
@@ -389,7 +389,15 @@ export const FriendsPageWithRealAPI: React.FC<FriendsPageProps> = ({
       setSearchResult(null);
     } catch (error) {
       console.error('发送好友请求失败:', error);
-      alert('发送好友请求失败');
+      console.log('错误类型:', typeof error);
+      console.log('是否为 Error 实例:', error instanceof Error);
+      if (error instanceof Error) {
+        console.log('错误消息:', error.message);
+      }
+      // 显示后端返回的具体错误消息
+      const errorMessage = error instanceof Error ? error.message : '发送好友请求失败';
+      console.log('最终显示的错误消息:', errorMessage);
+      alert(errorMessage);
     }
   };
 
diff --git a/src/test/src/main/java/com/example/springboot_demo/controller/FriendRequestController.java b/src/test/src/main/java/com/example/springboot_demo/controller/FriendRequestController.java
index 5ca38743..a422bb12 100644
--- a/src/test/src/main/java/com/example/springboot_demo/controller/FriendRequestController.java
+++ b/src/test/src/main/java/com/example/springboot_demo/controller/FriendRequestController.java
@@ -1,13 +1,21 @@
 package com.example.springboot_demo.controller;
 
+import java.time.LocalDateTime;
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
 import com.example.springboot_demo.common.Result;
 import com.example.springboot_demo.entity.mysql.FriendRequest;
 import com.example.springboot_demo.service.FriendRequestService;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.web.bind.annotation.*;
-
-import java.time.LocalDateTime;
-import java.util.List;
 
 @RestController
 @RequestMapping("/friend-request")
@@ -33,12 +41,17 @@ public class FriendRequestController {
     
     @PostMapping
     public Result<FriendRequest> save(@RequestBody FriendRequest friendRequest) {
-        friendRequest.setCreateTime(LocalDateTime.now());
-        if (friendRequest.getStatus() == null) {
-            friendRequest.setStatus(0);
+        try {
+            friendRequest.setCreateTime(LocalDateTime.now());
+            if (friendRequest.getStatus() == null) {
+                friendRequest.setStatus(0);
+            }
+            friendRequestService.save(friendRequest);
+            return Result.success(friendRequest);
+        } catch (RuntimeException e) {
+            System.out.println("发送好友请求失败: " + e.getMessage());
+            return Result.error(e.getMessage());
         }
-        friendRequestService.save(friendRequest);
-        return Result.success(friendRequest);
     }
     
     @PutMapping
diff --git a/src/test/src/main/java/com/example/springboot_demo/service/impl/FriendRelationServiceImpl.java b/src/test/src/main/java/com/example/springboot_demo/service/impl/FriendRelationServiceImpl.java
index 3613d4cc..e28fc536 100644
--- a/src/test/src/main/java/com/example/springboot_demo/service/impl/FriendRelationServiceImpl.java
+++ b/src/test/src/main/java/com/example/springboot_demo/service/impl/FriendRelationServiceImpl.java
@@ -2,7 +2,9 @@ package com.example.springboot_demo.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.example.springboot_demo.entity.mysql.FriendRelation;
+import com.example.springboot_demo.entity.mysql.FriendRequest;
 import com.example.springboot_demo.mapper.FriendRelationMapper;
+import com.example.springboot_demo.mapper.FriendRequestMapper;
 import com.example.springboot_demo.service.FriendRelationService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
@@ -15,6 +17,9 @@ public class FriendRelationServiceImpl implements FriendRelationService {
     @Autowired
     private FriendRelationMapper friendRelationMapper;
     
+    @Autowired
+    private FriendRequestMapper friendRequestMapper;
+    
     @Override
     public List<FriendRelation> listByUserId(Long userId) {
         QueryWrapper<FriendRelation> wrapper = new QueryWrapper<>();
@@ -46,9 +51,29 @@ public class FriendRelationServiceImpl implements FriendRelationService {
     
     @Override
     public boolean removeByUserIdAndFriendId(Long userId, Long friendId) {
-        QueryWrapper<FriendRelation> wrapper = new QueryWrapper<>();
-        wrapper.eq("user_id", userId).eq("friend_id", friendId);
-        return friendRelationMapper.delete(wrapper) > 0;
+        // 删除双向好友关系
+        // 1. 删除 userId -> friendId
+        QueryWrapper<FriendRelation> wrapper1 = new QueryWrapper<>();
+        wrapper1.eq("user_id", userId).eq("friend_id", friendId);
+        friendRelationMapper.delete(wrapper1);
+        
+        // 2. 删除 friendId -> userId
+        QueryWrapper<FriendRelation> wrapper2 = new QueryWrapper<>();
+        wrapper2.eq("user_id", friendId).eq("friend_id", userId);
+        friendRelationMapper.delete(wrapper2);
+        
+        // 3. 删除所有相关的好友请求记录（双向）
+        // 删除 userId -> friendId 的请求
+        QueryWrapper<FriendRequest> requestWrapper1 = new QueryWrapper<>();
+        requestWrapper1.eq("applicant_id", userId).eq("recipient_id", friendId);
+        friendRequestMapper.delete(requestWrapper1);
+        
+        // 删除 friendId -> userId 的请求
+        QueryWrapper<FriendRequest> requestWrapper2 = new QueryWrapper<>();
+        requestWrapper2.eq("applicant_id", friendId).eq("recipient_id", userId);
+        friendRequestMapper.delete(requestWrapper2);
+        
+        return true;
     }
 }
 
diff --git a/src/test/src/main/java/com/example/springboot_demo/service/impl/FriendRequestServiceImpl.java b/src/test/src/main/java/com/example/springboot_demo/service/impl/FriendRequestServiceImpl.java
index e298e2d3..38b7e818 100644
--- a/src/test/src/main/java/com/example/springboot_demo/service/impl/FriendRequestServiceImpl.java
+++ b/src/test/src/main/java/com/example/springboot_demo/service/impl/FriendRequestServiceImpl.java
@@ -49,6 +49,20 @@ public class FriendRequestServiceImpl implements FriendRequestService {
     
     @Override
     public boolean save(FriendRequest friendRequest) {
+        // 1. 检查是否给自己发送好友请求
+        if (friendRequest.getApplicantId().equals(friendRequest.getRecipientId())) {
+            throw new RuntimeException("不能添加自己为好友");
+        }
+        
+        // 2. 检查是否已经是好友关系
+        FriendRelation existingRelation = friendRelationService.getByUserIdAndFriendId(
+            friendRequest.getApplicantId(), 
+            friendRequest.getRecipientId()
+        );
+        if (existingRelation != null) {
+            throw new RuntimeException("已经是好友，无需添加");
+        }
+        
         return friendRequestMapper.insert(friendRequest) > 0;
     }