diff --git a/packages/uploader/index.wxs b/packages/uploader/index.wxs
index 257c7804..c567ec28 100644
--- a/packages/uploader/index.wxs
+++ b/packages/uploader/index.wxs
@@ -3,7 +3,10 @@ var style = require('../wxs/style.wxs');
 var addUnit = require('../wxs/add-unit.wxs');
 
 function sizeStyle(data) {
-  return style({
+  return "Array" === data.previewSize.constructor ? style({
+    width: addUnit(data.previewSize[0]),
+    height: addUnit(data.previewSize[1]),
+  }) : style({
     width: addUnit(data.previewSize),
     height: addUnit(data.previewSize),
   });