diff --git a/apps/api/app/api/routes/generation_tasks.py b/apps/api/app/api/routes/generation_tasks.py
index 6547ec4b8..450d43f2f 100755
--- a/apps/api/app/api/routes/generation_tasks.py
+++ b/apps/api/app/api/routes/generation_tasks.py
@@ -368,7 +368,9 @@ def create_generation_task(
                     log_task_status=True,
                 ):
                     created_tasks.append(task)
-                    if request.source_edit_plan_id:
+                    # 只在首个成功任务时回写一次 plan.config，
+                    # 避免批量生成时循环覆盖 generation_task_id
+                    if request.source_edit_plan_id and len(created_tasks) == 1:
                         _writeback_edit_plan_config(
                             plan_id=request.source_edit_plan_id,
                             task_id=task.id,