diff --git a/python/test/test_MaskRCNN.py b/python/test/test_MaskRCNN.py
index bb78b4148..adf5c8a2a 100755
--- a/python/test/test_MaskRCNN.py
+++ b/python/test/test_MaskRCNN.py
@@ -82,6 +82,8 @@ def __init__(self,
 
         self.mode = mode.lower()
         self.path_yaml = path_yaml
+        if not os.path.exists(self.path_default_MaskRCNN_dataset):
+            assert 0, "[MaskRCNN-Error]  for test_MaskRCNN.py npz/pt is loaded in only one way, 1st is NNMODELS_PATH for regression,please ensure {} exists, model-zoo never use this file!".format(self.path_default_MaskRCNN_dataset)
         if self.path_yaml is None:
             self.path_yaml = self.path_default_MaskRCNN_dataset + "CONFIG_MaskRCNN.yaml"
         assert os.path.exists(self.path_yaml), "[MaskRCNN-Test-Error] {} yaml path is not exist! There's example at tpu-mlir/regression/dataset/MaskRCNN/CONFIG_MaskRCNN.yaml".format(self.path_yaml,)
diff --git a/python/tools/tool_maskrcnn.py b/python/tools/tool_maskrcnn.py
index affec2774..f6ffa2fb2 100755
--- a/python/tools/tool_maskrcnn.py
+++ b/python/tools/tool_maskrcnn.py
@@ -34,12 +34,14 @@ def __init__(self, debug: bool = True, path_custom_dataset: str = None):
             self.print_debug("[Warning] path_default_MaskRCNN_dataset is changed from default path: {} to new path: {}".format(self.path_default_MaskRCNN_dataset, path_custom_dataset))
             self.path_default_MaskRCNN_dataset =  path_custom_dataset
         if not os.path.exists(self.path_default_MaskRCNN_dataset):
+          if os.getenv('NNMODELS_PATH') is not None:
             self.path_default_MaskRCNN_dataset = os.getenv('NNMODELS_PATH') + "/maskrcnn_models/"
             if not os.path.exists(self.path_default_MaskRCNN_dataset):
                git_command = 'git --git-dir={}/.git log'.format(os.getenv('NNMODELS_PATH'))
                os.system(git_command)
                assert 0, "[MaskRCNN-Error] dataset path not found, expect {}".format(self.path_default_MaskRCNN_dataset)
-
+        else:
+          print("[MaskRCNN-Warning] NNMODELS_PATH is not exist, might used for model-zoo")
     def print_debug(self, *info):
         if self.DEBUG_MASKRCNN:
             print(*info)