diff --git a/python/VolcEngine.py b/python/VolcEngine.py
index e038dfb..13e180b 100644
--- a/python/VolcEngine.py
+++ b/python/VolcEngine.py
@@ -20,7 +20,7 @@ class VolcEngine(TranslateParent):
     @staticmethod
     def _start_translate_threads(tag_list: list, target_language: str, api_instance) -> dict:
         index = -1
-        if type(tag_list[0] == dict):
+        if isinstance(tag_list[0], dict):
             index = tag_list.pop(0)["index"]
         translate_text_request = volcenginesdktranslate20250301.TranslateTextRequest(
             source_language="en",
@@ -29,6 +29,8 @@ class VolcEngine(TranslateParent):
         )
         try:
             response = api_instance.translate_text(translate_text_request)
+            if index == -1:
+                return {"thread_status": True, "thread_data": response.translation_list}
             return {"thread_status": True, "thread_data": response.translation_list, "index": index}
         except ApiException as e:
             # 复制代码运行示例，请自行打印API错误信息。