diff --git a/app/views/libraries/show.html.erb b/app/views/libraries/show.html.erb
index 6a0e8c58..252dddec 100644
--- a/app/views/libraries/show.html.erb
+++ b/app/views/libraries/show.html.erb
@@ -78,6 +78,9 @@
 <script>
     function getMore(item) {
         var at=$(item).attr("at");
+        var one=parseInt($("#private_reason_ul").find("li").eq(0).height())+10;
+        var two=parseInt($("#private_reason_ul").find("li").eq(1).height());
+        var plus=one+two;
         if(at=="0"){
             $(item).html('点击收起<i class="iconfont icon-shangjiantou color-blue font-14 ml5"></i>');
             $(item).attr("at","1");
@@ -85,7 +88,7 @@
         }else{
             $(item).html('点击展开<i class="iconfont icon-xiajiantou color-blue font-14 ml5"></i>');
             $(item).attr("at","0");
-            $(".private_reason").css({maxHeight:"163px"});
+            $(".private_reason").css({maxHeight:plus+"px"});
         }
     }
     var homeworkDescr = editormd.markdownToHTML("labraries_editorMd_content", {