diff --git a/src/layer.js b/src/layer.js
index 9c75351..aa4133e 100644
--- a/src/layer.js
+++ b/src/layer.js
@@ -1044,8 +1044,9 @@ layer.prompt = function(options, yes){
   
   if(typeof options === 'function') yes = options;
   
+  var area = 'auto'; 
   if(options.area){
-    var area = options.area;
+    area = options.area;
     style = 'style="width: '+ area[0] +'; height: '+ area[1] + ';"';
     delete options.area;
   }
@@ -1060,6 +1061,7 @@ layer.prompt = function(options, yes){
     type: 1
     ,btn: ['确定','取消']
     ,content: content
+    ,area:area
     ,skin: 'layui-layer-prompt' + skin('prompt')
     ,maxWidth: win.width()
     ,success: function(layero){