diff --git a/qiniu/rs.js b/qiniu/rs.js
index de373db9..6a5b74cf 100644
--- a/qiniu/rs.js
+++ b/qiniu/rs.js
@@ -209,6 +209,8 @@ function PutPolicy2(putPolicyObj) {
 
   this.fsizeLimit = putPolicyObj.fsizeLimit || null;
 
+  this.fsizeMin = putPolicyObj.fsizeMin || null;
+
   this.detectMime = putPolicyObj.detectMime || null;
 
   this.mimeLimit = putPolicyObj.mimeLimit || null;
@@ -228,7 +230,7 @@ PutPolicy2.prototype.token = function(mac) {
 
 PutPolicy2.prototype.getFlags = function() {
   var flags = {};
-  var attrs = ['scope', 'insertOnly', 'saveKey', 'endUser', 'returnUrl', 'returnBody', 'callbackUrl', 'callbackHost', 'callbackBody', 'callbackBodyType', 'callbackFetchKey', 'persistentOps', 'persistentNotifyUrl', 'persistentPipeline', 'fsizeLimit', 'detectMime', 'mimeLimit'];
+  var attrs = ['scope', 'insertOnly', 'saveKey', 'endUser', 'returnUrl', 'returnBody', 'callbackUrl', 'callbackHost', 'callbackBody', 'callbackBodyType', 'callbackFetchKey', 'persistentOps', 'persistentNotifyUrl', 'persistentPipeline', 'fsizeLimit','fsizeMin', 'detectMime', 'mimeLimit'];
 
   for (var i = attrs.length - 1; i >= 0; i--) {
     if (this[attrs[i]] !== null) {