diff --git a/modelscope/models/builder.py b/modelscope/models/builder.py
index b57fba53..f2bba487 100644
--- a/modelscope/models/builder.py
+++ b/modelscope/models/builder.py
@@ -13,7 +13,7 @@ MODELS = Registry('models')
 BACKBONES = MODELS
 HEADS = Registry('heads')
 
-modules = LazyImportModule.AST_INDEX[INDEX_KEY]
+modules = LazyImportModule.get_ast_index()[INDEX_KEY]
 for module_index in list(modules.keys()):
     if module_index[1] == Tasks.backbone and module_index[0] == 'BACKBONES':
         modules[(MODELS.name.upper(), module_index[1],
diff --git a/modelscope/utils/automodel_utils.py b/modelscope/utils/automodel_utils.py
index 36526460..eb4aa6c8 100644
--- a/modelscope/utils/automodel_utils.py
+++ b/modelscope/utils/automodel_utils.py
@@ -15,7 +15,7 @@ def can_load_by_ms(model_dir: str, task_name: Optional[str],
     if model_type is None or task_name is None:
         return False
     if ('MODELS', task_name,
-            model_type) in LazyImportModule.AST_INDEX[INDEX_KEY]:
+            model_type) in LazyImportModule.get_ast_index()[INDEX_KEY]:
         return True
     ms_wrapper_path = os.path.join(model_dir, 'ms_wrapper.py')
     if os.path.exists(ms_wrapper_path):
diff --git a/modelscope/utils/import_utils.py b/modelscope/utils/import_utils.py
index 8c897ddb..a3297684 100644
--- a/modelscope/utils/import_utils.py
+++ b/modelscope/utils/import_utils.py
@@ -26,8 +26,6 @@ else:
 
 logger = get_logger(log_level=logging.WARNING)
 
-AST_INDEX = None
-
 
 def import_modules_from_file(py_file: str):
     """ Import module from a certrain file
@@ -378,9 +376,7 @@ def tf_required(func):
 
 
 class LazyImportModule(ModuleType):
-    AST_INDEX = None
-    if AST_INDEX is None:
-        AST_INDEX = load_index()
+    _AST_INDEX = None
 
     def __init__(self,
                  name,
@@ -442,12 +438,15 @@ class LazyImportModule(ModuleType):
 
     def _get_module(self, module_name: str):
         try:
-            # check requirements before module import
             module_name_full = self.__name__ + '.' + module_name
-            if module_name_full in LazyImportModule.AST_INDEX[REQUIREMENT_KEY]:
-                requirements = LazyImportModule.AST_INDEX[REQUIREMENT_KEY][
-                    module_name_full]
-                requires(module_name_full, requirements)
+            if not any(
+                    module_name_full.startswith(f'modelscope.{prefix}')
+                    for prefix in ['hub', 'utils', 'version', 'fileio']):
+                # check requirements before module import
+                ast_index = self.get_ast_index()
+                if module_name_full in ast_index[REQUIREMENT_KEY]:
+                    requirements = ast_index[REQUIREMENT_KEY][module_name_full]
+                    requires(module_name_full, requirements)
             return importlib.import_module('.' + module_name, self.__name__)
         except Exception as e:
             raise RuntimeError(
@@ -458,6 +457,12 @@ class LazyImportModule(ModuleType):
         return self.__class__, (self._name, self.__file__,
                                 self._import_structure)
 
+    @staticmethod
+    def get_ast_index():
+        if LazyImportModule._AST_INDEX is None:
+            LazyImportModule._AST_INDEX = load_index()
+        return LazyImportModule._AST_INDEX
+
     @staticmethod
     def import_module(signature):
         """ import a lazy import module using signature
@@ -465,12 +470,12 @@ class LazyImportModule(ModuleType):
         Args:
             signature (tuple): a tuple of str, (registry_name, registry_group_name, module_name)
         """
-        if signature in LazyImportModule.AST_INDEX[INDEX_KEY]:
-            mod_index = LazyImportModule.AST_INDEX[INDEX_KEY][signature]
+        ast_index = LazyImportModule.get_ast_index()
+        if signature in ast_index[INDEX_KEY]:
+            mod_index = ast_index[INDEX_KEY][signature]
             module_name = mod_index[MODULE_KEY]
-            if module_name in LazyImportModule.AST_INDEX[REQUIREMENT_KEY]:
-                requirements = LazyImportModule.AST_INDEX[REQUIREMENT_KEY][
-                    module_name]
+            if module_name in ast_index[REQUIREMENT_KEY]:
+                requirements = ast_index[REQUIREMENT_KEY][module_name]
                 requires(module_name, requirements)
             importlib.import_module(module_name)
         else:
diff --git a/modelscope/utils/registry.py b/modelscope/utils/registry.py
index 38071bb8..e6556d9c 100644
--- a/modelscope/utils/registry.py
+++ b/modelscope/utils/registry.py
@@ -9,7 +9,6 @@ from modelscope.utils.logger import get_logger
 TYPE_NAME = 'type'
 default_group = 'default'
 logger = get_logger()
-AST_INDEX = None
 
 
 class Registry(object):