diff --git a/src/widget/date/calendar/picker.year.js b/src/widget/date/calendar/picker.year.js
index fef2ba069..389ee51cb 100644
--- a/src/widget/date/calendar/picker.year.js
+++ b/src/widget/date/calendar/picker.year.js
@@ -87,14 +87,14 @@ BI.YearPicker = BI.inherit(BI.Widget, {
 
     _checkLeftValid: function () {
         var o = this.options;
-        var valid = !(this._year === BI.parseDateTime(o.min, "%Y-%X-%d").getFullYear());
+        var valid = this._year > BI.parseDateTime(o.min, "%Y-%X-%d").getFullYear();
         this.left.setEnable(valid);
         return valid;
     },
 
     _checkRightValid: function () {
         var o = this.options;
-        var valid = !(this._year === BI.parseDateTime(o.max, "%Y-%X-%d").getFullYear());
+        var valid = this._year < BI.parseDateTime(o.max, "%Y-%X-%d").getFullYear();
         this.right.setEnable(valid);
         return valid;
     },