diff --git a/lib/timeline/component/ItemSet.js b/lib/timeline/component/ItemSet.js
index a7e50cd2..5ae07ade 100644
--- a/lib/timeline/component/ItemSet.js
+++ b/lib/timeline/component/ItemSet.js
@@ -1213,6 +1213,7 @@ ItemSet.prototype._getGroupIndex = function(groupId) {
  * @private
  */
 ItemSet.prototype._onDragStart = function (event) {
+  if (this.touchParams.itemIsDragging) { return; }
   var item = this.touchParams.item || null;
   var me = this;
   var props;