diff --git a/icartt/dataset.py b/icartt/dataset.py
index ce8d6c4406185a290ddbb310191958c028aa791f..3a67a382424c499cc09390bf963323ae11a37ffe 100644
--- a/icartt/dataset.py
+++ b/icartt/dataset.py
@@ -1,6 +1,5 @@
 import datetime
 import sys
-from __builtin__ import property
 
 class Variable:
     @property