diff --git a/backend/src/main/java/com/designhub/service/TaskItemService.java b/backend/src/main/java/com/designhub/service/TaskItemService.java
index d2b1bd7..9948387 100644
--- a/backend/src/main/java/com/designhub/service/TaskItemService.java
+++ b/backend/src/main/java/com/designhub/service/TaskItemService.java
@@ -424,7 +424,6 @@ public class TaskItemService {
             for (TaskItem item : groupItems) {
                 item.setStatus("in_progress");
                 item.setReceiverId(assignedReceiverId);
-                item.setStartTime(LocalDateTime.now());
                 item.setUpdateTime(LocalDateTime.now());
                 taskItemMapper.updateById(item);
             }