diff --git a/public/images/introduce/trustie8_01.jpg b/public/images/introduce/trustie8_01.jpg
new file mode 100644
index 000000000..e6d3de6bf
Binary files /dev/null and b/public/images/introduce/trustie8_01.jpg differ
diff --git a/public/images/introduce/trustie8_01.png b/public/images/introduce/trustie8_01.png
deleted file mode 100644
index 7832642f2..000000000
Binary files a/public/images/introduce/trustie8_01.png and /dev/null differ
diff --git a/public/stylesheets/css/structure.css b/public/stylesheets/css/structure.css
index 1718a8ad2..a4e1058db 100644
--- a/public/stylesheets/css/structure.css
+++ b/public/stylesheets/css/structure.css
@@ -519,7 +519,7 @@ a.user_editinfo{border-top:1px solid #e5e5e5; height:30px; line-height:30px; tex
 .content_Intruduce{min-width: 1200px;}
 .inline{width: auto;display: inline-block;}
 .in_head{
-    height: 640px;background:url("/images/introduce/trustie8_01.png");
+    height: 640px;background:url("/images/introduce/trustie8_01.jpg");
     position: relative;
     background-size: cover;
     background-position: center;