diff --git a/supwisdom/protocol/nettrans.py b/supwisdom/protocol/nettrans.py
index 6c651f3..35c9619 100644
--- a/supwisdom/protocol/nettrans.py
+++ b/supwisdom/protocol/nettrans.py
@@ -3,7 +3,10 @@
 所有数据都是 unicode  utf-8 编码
 """
 import traceback
-import simplejson as json
+try:
+    import json
+except ImportError:
+    import simplejson as json
 
 """
 后台服务的字符编码