diff --git a/Learun.Framework.Ultimate V7/Learun.Application.Web/Views/LR_Content/script/lr-layer.js b/Learun.Framework.Ultimate V7/Learun.Application.Web/Views/LR_Content/script/lr-layer.js
index 8cc37b7cd..ca76d7bcb 100644
--- a/Learun.Framework.Ultimate V7/Learun.Application.Web/Views/LR_Content/script/lr-layer.js	
+++ b/Learun.Framework.Ultimate V7/Learun.Application.Web/Views/LR_Content/script/lr-layer.js	
@@ -70,7 +70,7 @@
             dfop.width = dfop.width > $(window).width() ? $(window).width() - 10 : dfop.width;
             dfop.height = dfop.height > $(window).height() ? $(window).height() - 10 : dfop.height;
             var r = 0;
-            r=top.layer.open({
+            r = top.layer.open({
                 id: dfop.id,
                 maxmin: dfop.maxmin,
                 type: 2, //0（信息框，默认）1（页面层）2（iframe层）3（加载层）4（tips层）
@@ -80,6 +80,12 @@
                 content: op.url,
                 skin: dfop.btn == null ? 'lr-layer-nobtn' : 'lr-layer',
                 success: function (layero, index) {
+                    if (dfop.id == "PreviewForm") {
+                        if (layero.find("iframe").length > 0 && layero.find("iframe").contents().find("img").length > 0) {
+                            layero.find("iframe").contents().find("img").css({ "max-width": "100%", "max-height": "100%", "width": "auto", "height": "auto" });
+                        }
+                    }
+
                     top['layer_' + dfop.id] = learun.iframe($(layero).find('iframe').attr('id'), top.frames);
                     layero[0].learun_layerid = 'layer_' + dfop.id;
                     //如果底部有按钮添加-确认并关闭窗口勾选按钮
@@ -298,7 +304,7 @@
                 }
             });
         },
-		
+
         // 关闭弹层
         layerClose: function (name, index) {
             var _index;