diff --git a/.gitignore b/.gitignore
index a354b9d..82c7dc8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ logs
 *.seed
 node_modules/
 .sass-cache/
+research/
 test/
 backup/
 *.bat
diff --git a/research/katex-test.html b/research/katex-test.html
deleted file mode 100644
index db40b5f..0000000
--- a/research/katex-test.html
+++ /dev/null
@@ -1,42 +0,0 @@
-<!DOCTYPE html>
-<html lang="zh">
-	<head>
-		<meta charset="utf-8" />
-		<title>Katex test</title>
-		<style type="text/css">
-			body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td,hr,button,article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{margin:0;padding:0;}
-
-			article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section, summary {display: block;}
-			audio, canvas, video {display: inline-block;}
-
-			body,html{width:100%;}
-
-			body, button, input, select, textarea {font:12px/1.5 Tahoma, "Hiragino Sans GB", "Microsoft Yahei", Arial;}
-			body{font-size:12px;color:#666;background:#fff url(../images/) no-repeat left top;}
-
-			body{font-size:14px;color:#444;font-family:"微软雅黑",Arial;background:#fff;}
-
-			a{color:#444;text-decoration: none;}
-			a:hover{color:#065BC2;text-decoration: none;}
-
-			.clear{zoom:1;}
-			.clear:after{content:"";height:0;visibility:hidden;clear:both;display:block;}
-
-			img{border:none;vertical-align: middle;}
-			ul{list-style: none;}
-		</style>
-	</head>
-	<body>
-		<span class="katex">c = \pm\sqrt{a^2 + b^2}</span>
-		<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.1.1/katex.min.css">
-		<script src="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.1.1/katex.min.js"></script>
-		<script src="http://libs.baidu.com/jquery/1.9.0/jquery.min.js"></script>
-		<script type="text/javascript">
-			$(function(){
-				$(".katex").each(function(){
-					katex.render($(this).html(), $(this)[0]);
-				});
-			});
-		</script>
-	</body>
-</html>
\ No newline at end of file
