diff --git a/aip/face.py b/aip/face.py
index 8b4c0c8..5f5b5be 100644
--- a/aip/face.py
+++ b/aip/face.py
@@ -278,7 +278,7 @@ def personVerify(self, image, image_type, id_card_number, name, options=None):
         data['name'] = name
 
         data.update(options)
-        return self._request(self.__personVerifyUrl, json.dumps(data, ensure_ascii=False), {
+        return self._request(self.__personVerifyUrl, json.dumps(data, ensure_ascii=False).encode('utf-8'), {
             'Content-Type': 'application/json',
         })