diff --git a/backend/src/main/java/com/budwk/app/client/module/activity/controller/ClientActivityController.java b/backend/src/main/java/com/budwk/app/client/module/activity/controller/ClientActivityController.java
index a0a95e0..8880542 100644
--- a/backend/src/main/java/com/budwk/app/client/module/activity/controller/ClientActivityController.java
+++ b/backend/src/main/java/com/budwk/app/client/module/activity/controller/ClientActivityController.java
@@ -9,6 +9,7 @@ import com.budwk.app.client.module.activity.vo.ClientActivitySignVO;
 import com.budwk.app.module.activity.models.ActUser;
 import com.budwk.app.module.activity.models.Activity;
 import com.budwk.app.web.commons.auth.satoken.StpClientUtil;
+import lombok.Synchronized;
 import org.nutz.dao.Cnd;
 import org.nutz.dao.Dao;
 import org.nutz.dao.FieldFilter;
@@ -81,6 +82,7 @@ public class ClientActivityController {
     @At("/sign-up")
     @AdaptBy(type = JsonAdaptor.class)
     @SaCheckLogin(type = StpClientUtil.TYPE)
+    @Synchronized
     public synchronized Result signUp(ClientActivitySignVO signVO) {
         clientActivityService.signUp(signVO);
         return Result.success();