diff --git a/rtp_llm/openai/openai_endpoint.py b/rtp_llm/openai/openai_endpoint.py
index 2b1ba642b6..fad59e2f19 100644
--- a/rtp_llm/openai/openai_endpoint.py
+++ b/rtp_llm/openai/openai_endpoint.py
@@ -138,10 +138,17 @@ def _extract_generation_config(
         request_stop_words_list = request.stop if request.stop != None else []
         if isinstance(request_stop_words_list, str):
             request_stop_words_list = [request_stop_words_list]
-        config.stop_words_str = self.stop_words_str_list + request_stop_words_list
+        config.stop_words_str = list(
+            set(
+                self.stop_words_str_list
+                + request_stop_words_list
+                + config.stop_words_str
+            )
+        )
         config.stop_words_list = (
             self.stop_words_id_list
-            + self.chat_renderer.tokenize_words(request_stop_words_list)
+            + self.chat_renderer.tokenize_words(config.stop_words_str)
+            + config.stop_words_list
         )
         if request.chat_id != None:
             config.chat_id = request.chat_id