diff --git a/lang_agent/graphs/routing.py b/lang_agent/graphs/routing.py
index 2dc791a..ed4c7f9 100644
--- a/lang_agent/graphs/routing.py
+++ b/lang_agent/graphs/routing.py
@@ -37,21 +37,12 @@ class RoutingConfig(KeyConfig):
     base_url:str = "https://dashscope.aliyuncs.com/compatible-mode/v1"
     """base url; could be used to overwrite the baseurl in llm provider"""
 
-    sys_promp_json: str = None
-    "path to json contantaining system prompt for graphs; Will overwrite systemprompt from xiaozhi if 'chat_prompt' is provided"
+    sys_promp_dir: str = osp.join(osp.dirname(osp.dirname(osp.dirname(__file__))), "configs", "route_sys_prompts")
+    """path to directory or json contantaining system prompt for graphs; Will overwrite systemprompt from xiaozhi if 'chat_prompt' is provided"""
 
     tool_manager_config: ToolManagerConfig = field(default_factory=ToolManagerConfig)
 
 
-    def __post_init__(self):
-        super().__post_init__()
-        if self.sys_promp_json is None:
-            # self.sys_promp_json = osp.join(osp.dirname(osp.dirname(osp.dirname(__file__))), "configs", "route_sys_prompts.json")
-            self.sys_promp_json = osp.join(osp.dirname(osp.dirname(osp.dirname(__file__))), "configs", "route_sys_prompts")
-            logger.warning(f"config_f was not provided. Using default: {self.sys_promp_json}")
-        
-        assert osp.exists(self.sys_promp_json), f"config_f {self.sys_promp_json} does not exist."
-
 
 class Route(BaseModel):
     step: Literal["chat", "order"] = Field(
@@ -140,14 +131,14 @@ class RoutingGraph(GraphBase):
         self._load_sys_prompts()
     
     def _load_sys_prompts(self):
-        if "json" in self.config.sys_promp_json[-5:]:
+        if "json" in self.config.sys_promp_dir[-5:]:
             logger.info("loading sys prompt from json")
-            with open(self.config.sys_promp_json , "r") as f:
+            with open(self.config.sys_promp_dir , "r") as f:
                 self.prompt_dict:Dict[str, str] = commentjson.load(f)
 
-        elif osp.isdir(self.config.sys_promp_json):
+        elif osp.isdir(self.config.sys_promp_dir):
             logger.info("loading sys_prompt from txt")
-            sys_fs = glob.glob(osp.join(self.config.sys_promp_json, "*.txt"))
+            sys_fs = glob.glob(osp.join(self.config.sys_promp_dir, "*.txt"))
             sys_fs = sorted([e for e in sys_fs if not ("optional" in e)])
             self.prompt_dict = {}
             for sys_f in sys_fs:
@@ -155,7 +146,7 @@ class RoutingGraph(GraphBase):
                 with open(sys_f, "r") as f:
                     self.prompt_dict[key] = f.read()
         else:
-            err_msg = f"{self.config.sys_promp_json} is not supported"
+            err_msg = f"{self.config.sys_promp_dir} is not supported"
             assert 0, err_msg
         
         for k, _ in self.prompt_dict.items():