diff --git a/api/app/controllers/prompt_optimizer_controller.py b/api/app/controllers/prompt_optimizer_controller.py
index 80f14cd3..b9fc697c 100644
--- a/api/app/controllers/prompt_optimizer_controller.py
+++ b/api/app/controllers/prompt_optimizer_controller.py
@@ -124,10 +124,11 @@ async def get_prompt_opt(
                     skill=data.skill
             ):
                 # chunk 是 prompt 的增量内容
-                yield f"event:message\ndata: {json.dumps(chunk)}\n\n"
+                yield f"event:message\ndata: {json.dumps(chunk, ensure_ascii=False)}\n\n"
         except Exception as e:
             yield f"event:error\ndata: {json.dumps(
-                {"error": str(e)}
+                {"error": str(e)},
+                ensure_ascii=False
             )}\n\n"
         yield "event:end\ndata: {}\n\n"
 
diff --git a/api/app/services/prompt_optimizer_service.py b/api/app/services/prompt_optimizer_service.py
index b1de84d2..30901111 100644
--- a/api/app/services/prompt_optimizer_service.py
+++ b/api/app/services/prompt_optimizer_service.py
@@ -236,8 +236,11 @@ class PromptOptimizerService:
                 logger.error(f"Unsupported content type - {content}")
                 raise Exception("Unsupported content type")
             cache = buffer[:-20]
+            last_idx = 19
+            while cache and cache[-1] == '\\' and last_idx > 0:
+                cache = buffer[:-last_idx]
+                last_idx -= 1
 
-            # 尝试找到 "prompt": " 开始位置
             if prompt_finished:
                 continue
 
@@ -279,7 +282,7 @@ class PromptOptimizerService:
     def parser_prompt_variables(prompt: str):
         try:
             pattern = r'\{\{\s*([a-zA-Z_][a-zA-Z0-9_]*)\s*\}\}'
-            matches = re.findall(pattern, prompt)
+            matches = re.findall(pattern, str(prompt))
             variables = list(set(matches))
             return variables
         except Exception as e: