diff --git a/paddlespeech/resource/resource.py b/paddlespeech/resource/resource.py
index fff5f745dd9242f08f6ec6116cd84b167a04bddb..369dba900079b4bf8591c1862d46a1d7b3898d74 100644
--- a/paddlespeech/resource/resource.py
+++ b/paddlespeech/resource/resource.py
@@ -82,7 +82,7 @@ class CommonTaskResource:
             self.model_tag = model_tag
             self.version = version
             self.res_dict = self.pretrained_models[model_tag][version]
-            self.format_path(self.res_dict)
+            self._format_path(self.res_dict)
             self.res_dir = self._fetch(self.res_dict,
                                        self._get_model_dir(model_type))
         else:
@@ -90,19 +90,10 @@ class CommonTaskResource:
             self.voc_model_tag = model_tag
             self.voc_version = version
             self.voc_res_dict = self.pretrained_models[model_tag][version]
-            self.format_path(self.voc_res_dict)
+            self._format_path(self.voc_res_dict)
             self.voc_res_dir = self._fetch(self.voc_res_dict,
                                            self._get_model_dir(model_type))
 
-    @staticmethod
-    def format_path(res_dict: Dict[str, str]):
-        for k, v in res_dict.items():
-            if '/' in v:
-                if v.startswith('https://') or v.startswith('http://'):
-                    continue
-                else:
-                    res_dict[k] = os.path.join(*(v.split('/')))
-
     @staticmethod
     def get_model_class(model_name) -> List[object]:
         """Dynamic import model class.
@@ -231,3 +222,12 @@ class CommonTaskResource:
             os.PathLike: Directory of model resource.
         """
         return download_and_decompress(res_dict, target_dir)
+
+    @staticmethod
+    def _format_path(res_dict: Dict[str, str]):
+        for k, v in res_dict.items():
+            if isinstance(v, str) and '/' in v:
+                if v.startswith('https://') or v.startswith('http://'):
+                    continue
+                else:
+                    res_dict[k] = os.path.join(*(v.split('/')))