diff --git a/client-api/src/main/java/org/jiayunet/controller/UserResumeController.java b/client-api/src/main/java/org/jiayunet/controller/UserResumeController.java
index 2bc1402..26e1665 100644
--- a/client-api/src/main/java/org/jiayunet/controller/UserResumeController.java
+++ b/client-api/src/main/java/org/jiayunet/controller/UserResumeController.java
@@ -70,6 +70,12 @@ public class UserResumeController {
         userResumeService.deleteResume(resumeId);
     }
 
+    /** 设置默认简历 */
+    @PostMapping("/setDefault")
+    public void setDefaultResume(@RequestParam Long resumeId) {
+        userResumeService.setDefaultResume(resumeId);
+    }
+
     // ==================== 教育经历 ====================
 
     /** 查询简历的教育经历列表 */
diff --git a/client-api/src/main/java/org/jiayunet/service/UserResumeService.java b/client-api/src/main/java/org/jiayunet/service/UserResumeService.java
index 6530b49..59e97c2 100644
--- a/client-api/src/main/java/org/jiayunet/service/UserResumeService.java
+++ b/client-api/src/main/java/org/jiayunet/service/UserResumeService.java
@@ -102,7 +102,9 @@ public class UserResumeService {
             if (resume.getResumeName() == null) {
                 resume.setResumeName("我的简历");
             }
-            resume.setIsDefault(0);
+            // 第一份简历自动设为默认
+            boolean hasResume = userResumeMapper.selectCount(new LambdaQueryWrapper<UserResume>().eq(UserResume::getUserId, userId)) > 0;
+            resume.setIsDefault(hasResume ? 0 : 1);
             resume.setSortOrder(0);
             resume.setCreateTime(now);
             resume.setUpdateTime(now);
@@ -609,6 +611,27 @@ public class UserResumeService {
                 .set(UserResume::getUpdateTime, Instant.now()));
     }
 
+    /**
+     * 设置默认简历
+     * <p>1. 查询用户所有简历，无简历则报错 2. 校验resumeId存在于用户简历中 3. 全部置为非默认，目标简历置为默认</p>
+     */
+    @Transactional(rollbackFor = Exception.class)
+    public void setDefaultResume(Long resumeId) {
+        Long userId = UserSecurityTool.getUserId();
+        List<UserResume> resumeList = userResumeMapper.selectList(new LambdaQueryWrapper<UserResume>().eq(UserResume::getUserId, userId));
+        if (resumeList.isEmpty()) {
+            throw new BusinessException(BusinessExpCodeEnum.DATA_NOT_EXIST, "暂无简历");
+        }
+        boolean exists = resumeList.stream().anyMatch(r -> r.getId().equals(resumeId));
+        if (!exists) {
+            throw new BusinessException(BusinessExpCodeEnum.DATA_NOT_EXIST, "简历不存在");
+        }
+        // 全部置为非默认
+        userResumeMapper.update(null, new LambdaUpdateWrapper<UserResume>().eq(UserResume::getUserId, userId).set(UserResume::getIsDefault, 0));
+        // 目标简历置为默认
+        userResumeMapper.update(null, new LambdaUpdateWrapper<UserResume>().eq(UserResume::getId, resumeId).set(UserResume::getIsDefault, 1));
+    }
+
     /**
      * 校验简历归属当前用户
      */