diff --git a/zh-cn/application-dev/ui/ui-js-animate-background-position-style.md b/zh-cn/application-dev/ui/ui-js-animate-background-position-style.md
index 4019f5cd8bd4f6509a0b8904620f6f10112e8578..fe8be536165df05d64993c143ce8e644eda63946 100644
--- a/zh-cn/application-dev/ui/ui-js-animate-background-position-style.md
+++ b/zh-cn/application-dev/ui/ui-js-animate-background-position-style.md
@@ -28,6 +28,7 @@
 .content{
   width: 400px;
   height: 400px;
+  /* 不建议图片长宽比为1:1 */
   background-image: url('common/images/bg-tv.jpg');
   background-size: 100%;
   background-repeat: no-repeat;