diff --git a/modelscope/preprocessors/nlp.py b/modelscope/preprocessors/nlp.py
index 1624e746..9c7e2ff4 100644
--- a/modelscope/preprocessors/nlp.py
+++ b/modelscope/preprocessors/nlp.py
@@ -198,6 +198,7 @@ class ZeroShotClassificationPreprocessor(Preprocessor):
         self.sequence_length = kwargs.pop('sequence_length', 512)
         self.candidate_labels = kwargs.pop('candidate_labels')
         self.hypothesis_template = kwargs.pop('hypothesis_template', '{}')
+        self.tokenizer = SbertTokenizer.from_pretrained(self.model_dir)
 
     @type_assert(object, str)
     def __call__(self, data: str) -> Dict[str, Any]: