diff --git a/src/core/constant/var.js b/src/core/constant/var.js
index cad439772..fc89511f5 100644
--- a/src/core/constant/var.js
+++ b/src/core/constant/var.js
@@ -19,8 +19,8 @@ BI._.extend(BI, {
         if (!BI.isNumber(pix)) {
             return pix;
         }
-        if (BI.pixUnit === "px") {
-            return (pix - (border || 0)) / BI.pixRatio;
+        if (BI.pixUnit === "px" && BI.pixRatio === 1) {
+            return (pix - (border || 0)) / BI.pixRatio + BI.pixUnit;
         }
         var length = pix / BI.pixRatio + BI.pixUnit;
         if (border > 0) {