diff --git a/index.html b/index.html
index 27ecd90..2b60e7d 100644
--- a/index.html
+++ b/index.html
@@ -84,7 +84,7 @@ th{display:table-cell;font-weight:bold;text-align:left}
 
 <div class="mod">
     <h3>在Docker中用filesite/machete快速搭建支持文件共享管理内容的图片网站<small>视频教程</small></h3>
-    <video width="100%" preload="metadata" playsinline controls id="video_docker">
+    <video width="100%" preload="metadata" playsinline controls id="video_docker" poster="/img/video_docker_pull_run_machete_1210_snap.png">
     </video>
 </div>