diff --git a/README.md b/README.md
index c5e9757..6b45e09 100644
--- a/README.md
+++ b/README.md
@@ -316,10 +316,11 @@ The operator takes a piece of text in string as input.
 It loads tokenizer and pre-trained model using model name.
 and then return text embedding in ndarray.
 
+***__call__(txt)***
 
 **Parameters:**
 
-***text***: *str*
+***txt***: *str*
 
 ​	The text in string.
 
@@ -329,3 +330,29 @@ and then return text embedding in ndarray.
 *numpy.ndarray*
 
 ​	The text embedding extracted by model.
+
+
+***save_model(format='pytorch', path='default')***
+
+Save model to local with specified format.
+
+**Parameters:**
+
+***format***: *str*
+
+​	The format of saved model, defaults to 'pytorch'.
+
+***format***: *path*
+
+​	The path where model is saved to. By default, it will save model to the operator directory.
+
+
+***supported_model_names(format=None)***
+
+Get a list of all supported model names or supported model names for specified model format.
+
+**Parameters:**
+
+***format***: *str*
+
+​	The model format such as 'pytorch', 'torchscript'.
diff --git a/auto_transformers.py b/auto_transformers.py
index 3d14f52..ce5b15c 100644
--- a/auto_transformers.py
+++ b/auto_transformers.py
@@ -76,13 +76,15 @@ class AutoTransformers(NNOperator):
         vec = features.detach().numpy()
         return vec
 
-    def save_model(self, format: str = 'default', path: str = 'default'):
+    def save_model(self, format: str = 'pytorch', path: str = 'default'):
         if path == 'default':
             path = str(Path(__file__).parent)
             name = self.model_name.replace('/', '-')
             path = os.path.join(path, name)
         inputs = self.tokenizer('[CLS]', return_tensors='pt')
-        if format == 'torchscript':
+        if format == 'pytorch':
+            torch.save(self.model, path)
+        elif format == 'torchscript':
             path = path + '.pt'
             inputs = list(inputs.values())
             try:
@@ -95,12 +97,13 @@ class AutoTransformers(NNOperator):
                 log.error(f'Fail to save as torchscript: {e}.')
                 raise RuntimeError(f'Fail to save as torchscript: {e}.')
         elif format == 'onxx':
-            pass
+            pass  # todo
         else:
-            torch.save(self.model, path)
+            log.error(f'Unsupported format "{format}".')
 
-    def get_model_name(self):
-        full_list = [
+    @staticmethod
+    def supported_model_names(format: str = None):
+        model_list = [
             "bert-large-uncased",
             "bert-base-cased",
             "bert-large-cased",
@@ -228,5 +231,59 @@ class AutoTransformers(NNOperator):
             "Musixmatch/umberto-commoncrawl-cased-v1",
             "Musixmatch/umberto-wikipedia-uncased-v1",
         ]
-        full_list.sort()
-        return full_list
+        model_list.sort()
+        if format is None:
+            pass
+        elif format == 'pytorch':
+            pass
+        elif format == 'torchscript':
+            model_list.remove(
+                'EleutherAI/gpt-j-6B',
+                'EleutherAI/gpt-neo-1.3B',
+                'allenai/led-base-16384',
+                'ctrl',
+                'distilgpt2',
+                'facebook/bart-large',
+                'google/bigbird-pegasus-large-arxiv',
+                'google/bigbird-pegasus-large-bigpatent',
+                'google/bigbird-pegasus-large-pubmed',
+                'google/canine-c',
+                'google/canine-s',
+                'google/reformer-crime-and-punishment',
+                'gpt2',
+                'gpt2-large',
+                'gpt2-medium',
+                'gpt2-xl',
+                'microsoft/deberta-base',
+                'microsoft/deberta-base-mnli',
+                'microsoft/deberta-large',
+                'microsoft/deberta-large-mnli',
+                'microsoft/deberta-xlarge',
+                'microsoft/deberta-xlarge-mnli',
+                'openai-gpt',
+                'transfo-xl-wt103',
+                'uw-madison/yoso-4096',
+                'xlm-clm-ende-1024',
+                'xlm-clm-enfr-1024',
+                'xlm-mlm-100-1280',
+                'xlm-mlm-17-1280',
+                'xlm-mlm-en-2048',
+                'xlm-mlm-ende-1024',
+                'xlm-mlm-enfr-1024',
+                'xlm-mlm-enro-1024',
+                'xlm-mlm-tlm-xnli15-1024',
+                'xlm-mlm-xnli15-1024',
+                'xlnet-base-cased',
+                'xlnet-large-cased',
+                'microsoft/deberta-v2-xlarge',
+                'microsoft/deberta-v2-xxlarge',
+                'microsoft/deberta-v2-xlarge-mnli',
+                'microsoft/deberta-v2-xxlarge-mnli',
+                'flaubert/flaubert_small_cased',
+                'flaubert/flaubert_base_uncased',
+                'flaubert/flaubert_base_cased',
+                'flaubert/flaubert_large_cased'
+            )
+        else:  # todo: format in {'onnx', 'tensorrt'}
+            log.error(f'Invalid format "{format}". Currently supported formats: "pytorch", "torchscript".')
+        return model_list