diff --git a/iot_upload.py b/iot_upload.py
index 6eefd50..e7875d7 100644
--- a/iot_upload.py
+++ b/iot_upload.py
@@ -187,7 +187,7 @@ def build_the_current_windowsApp(name):
         with open(the_last_windowsAppZIP) as f: content1 = f.read()
         with open(the_current_windowsAppZIP) as f: content2 = f.read()
 
-        if md5(content1.encode("utf8")).hexdigest() != md5(content2.encode("utf8")).hexdigest():
+        if md5(content1).hexdigest() != md5(content2).hexdigest():
             print ("比对结果：程序版本已更新")
             os.system('mkdir -p /tmp/a/ /tmp/b/ /tmp/IOTContainer/')
             os.system('unzip ' + the_last_windowsAppZIP + ' -d /tmp/a/')