diff --git a/src/case/trigger/trigger.text.select.js b/src/case/trigger/trigger.text.select.js
index dd7849115..ec47096da 100644
--- a/src/case/trigger/trigger.text.select.js
+++ b/src/case/trigger/trigger.text.select.js
@@ -52,7 +52,7 @@ BI.SelectTextTrigger = BI.inherit(BI.Trigger, {
 
     _digest: function (val, items) {
         var o = this.options;
-        val = BI.isArray(val) ? val : [val];
+        val = BI.isArray(val) ? val.slice() : [val];
 
         //  提升valueFormatter的优先级
         if (o.valueFormatter !== BI.emptyFn && BI.isFunction(o.valueFormatter)) {