diff --git a/packages/application/auth/wechat_sync_use_case.py b/packages/application/auth/wechat_sync_use_case.py
index 76d04e326..eae3b17e1 100644
--- a/packages/application/auth/wechat_sync_use_case.py
+++ b/packages/application/auth/wechat_sync_use_case.py
@@ -34,7 +34,7 @@ class WechatSyncRequest:
     ):
         self.openid = openid.strip()
         self.unionid = unionid.strip() if unionid else ""
-        self.nickname = nickname or "微信用户"
+        self.nickname = nickname or "小虾同学"  # 微信新规拿不到真实昵称，新用户默认昵称
         self.avatar_url = avatar_url or ""
         self.source = source
 
@@ -227,7 +227,7 @@ class WechatSyncUseCase:
             id=user_id,
             email=email,
             username=username,
-            display_name=request.nickname or "微信用户",
+            display_name=request.nickname or "小虾同学",
             password_hash=password_hash,
             email_verified=True,  # 微信登录视为已验证
             wechat_openid=request.openid,