diff --git a/_vnote.json b/_vnote.json
index 8bfb7bc7..cd8487d7 100644
--- a/_vnote.json
+++ b/_vnote.json
@@ -7,10 +7,10 @@
     "recycle_bin_folder": "_v_recycle_bin",
     "sub_directories": [
         {
-            "name": "en_US"
+            "name": "en_us"
         },
         {
-            "name": "zh_CN"
+            "name": "zh_cn"
         }
     ],
     "tags": [
diff --git a/en_US/_v_images/20181124154422086_1815676907.svg b/en_us/_v_images/20181124154422086_1815676907.svg
similarity index 100%
rename from en_US/_v_images/20181124154422086_1815676907.svg
rename to en_us/_v_images/20181124154422086_1815676907.svg
diff --git a/en_US/_v_images/20181124155022977_806133500.svg b/en_us/_v_images/20181124155022977_806133500.svg
similarity index 100%
rename from en_US/_v_images/20181124155022977_806133500.svg
rename to en_us/_v_images/20181124155022977_806133500.svg
diff --git a/en_US/_v_images/20181124155408890_125984506.svg b/en_us/_v_images/20181124155408890_125984506.svg
similarity index 100%
rename from en_US/_v_images/20181124155408890_125984506.svg
rename to en_us/_v_images/20181124155408890_125984506.svg
diff --git a/en_US/_v_images/20181124155541581_1337512834.svg b/en_us/_v_images/20181124155541581_1337512834.svg
similarity index 100%
rename from en_US/_v_images/20181124155541581_1337512834.svg
rename to en_us/_v_images/20181124155541581_1337512834.svg
diff --git a/en_US/_v_images/20181124160539465_1974001899.svg b/en_us/_v_images/20181124160539465_1974001899.svg
similarity index 100%
rename from en_US/_v_images/20181124160539465_1974001899.svg
rename to en_us/_v_images/20181124160539465_1974001899.svg
diff --git a/en_US/_v_images/20181124160655553_1770055980.svg b/en_us/_v_images/20181124160655553_1770055980.svg
similarity index 100%
rename from en_US/_v_images/20181124160655553_1770055980.svg
rename to en_us/_v_images/20181124160655553_1770055980.svg
diff --git a/en_US/_v_images/20181124161508229_152845752.svg b/en_us/_v_images/20181124161508229_152845752.svg
similarity index 100%
rename from en_US/_v_images/20181124161508229_152845752.svg
rename to en_us/_v_images/20181124161508229_152845752.svg
diff --git a/en_US/_v_images/20181124163939673_81017666.png b/en_us/_v_images/20181124163939673_81017666.png
similarity index 100%
rename from en_US/_v_images/20181124163939673_81017666.png
rename to en_us/_v_images/20181124163939673_81017666.png
diff --git a/en_US/_v_images/20181124164023649_131131901.png b/en_us/_v_images/20181124164023649_131131901.png
similarity index 100%
rename from en_US/_v_images/20181124164023649_131131901.png
rename to en_us/_v_images/20181124164023649_131131901.png
diff --git a/en_US/_v_images/20181124164046638_337092662.png b/en_us/_v_images/20181124164046638_337092662.png
similarity index 100%
rename from en_US/_v_images/20181124164046638_337092662.png
rename to en_us/_v_images/20181124164046638_337092662.png
diff --git a/en_US/_v_images/20181124164058289_1232467902.png b/en_us/_v_images/20181124164058289_1232467902.png
similarity index 100%
rename from en_US/_v_images/20181124164058289_1232467902.png
rename to en_us/_v_images/20181124164058289_1232467902.png
diff --git a/en_US/_v_images/20181124164129480_2136699189.png b/en_us/_v_images/20181124164129480_2136699189.png
similarity index 100%
rename from en_US/_v_images/20181124164129480_2136699189.png
rename to en_us/_v_images/20181124164129480_2136699189.png
diff --git a/en_US/_v_images/20181124164142595_204757426.png b/en_us/_v_images/20181124164142595_204757426.png
similarity index 100%
rename from en_US/_v_images/20181124164142595_204757426.png
rename to en_us/_v_images/20181124164142595_204757426.png
diff --git a/en_US/_v_images/20181124164149249_1895919077.png b/en_us/_v_images/20181124164149249_1895919077.png
similarity index 100%
rename from en_US/_v_images/20181124164149249_1895919077.png
rename to en_us/_v_images/20181124164149249_1895919077.png
diff --git a/en_US/_v_images/20181124164227082_1627336110.png b/en_us/_v_images/20181124164227082_1627336110.png
similarity index 100%
rename from en_US/_v_images/20181124164227082_1627336110.png
rename to en_us/_v_images/20181124164227082_1627336110.png
diff --git a/en_US/_v_images/20181124165109541_999429459.png b/en_us/_v_images/20181124165109541_999429459.png
similarity index 100%
rename from en_US/_v_images/20181124165109541_999429459.png
rename to en_us/_v_images/20181124165109541_999429459.png
diff --git a/en_US/_v_images/20181124165142716_2035299364.png b/en_us/_v_images/20181124165142716_2035299364.png
similarity index 100%
rename from en_US/_v_images/20181124165142716_2035299364.png
rename to en_us/_v_images/20181124165142716_2035299364.png
diff --git a/en_US/_vnote.json b/en_us/_vnote.json
similarity index 96%
rename from en_US/_vnote.json
rename to en_us/_vnote.json
index d9f875e7..2e31fde4 100644
--- a/en_US/_vnote.json
+++ b/en_us/_vnote.json
@@ -36,7 +36,7 @@
             "attachments": [
             ],
             "created_time": "2018-11-24T08:46:16Z",
-            "modified_time": "2018-11-24T08:53:24Z",
+            "modified_time": "2018-11-24T08:59:53Z",
             "name": "donate.md",
             "tags": [
             ]
diff --git a/en_US/blogs/_vnote.json b/en_us/blogs/_vnote.json
similarity index 100%
rename from en_US/blogs/_vnote.json
rename to en_us/blogs/_vnote.json
diff --git a/en_US/css/custom.css b/en_us/css/custom.css
similarity index 100%
rename from en_US/css/custom.css
rename to en_us/css/custom.css
diff --git a/en_US/css/file.svg b/en_us/css/file.svg
similarity index 100%
rename from en_US/css/file.svg
rename to en_us/css/file.svg
diff --git a/en_US/css/folder.svg b/en_us/css/folder.svg
similarity index 100%
rename from en_US/css/folder.svg
rename to en_us/css/folder.svg
diff --git a/en_US/css/github.svg b/en_us/css/github.svg
similarity index 100%
rename from en_US/css/github.svg
rename to en_us/css/github.svg
diff --git a/en_US/css/highlightjs.css b/en_us/css/highlightjs.css
similarity index 100%
rename from en_US/css/highlightjs.css
rename to en_us/css/highlightjs.css
diff --git a/en_US/css/viki.css b/en_us/css/viki.css
similarity index 100%
rename from en_US/css/viki.css
rename to en_us/css/viki.css
diff --git a/en_US/css/vnote.ico b/en_us/css/vnote.ico
similarity index 100%
rename from en_US/css/vnote.ico
rename to en_us/css/vnote.ico
diff --git a/en_US/css/vnote_white.svg b/en_us/css/vnote_white.svg
similarity index 100%
rename from en_US/css/vnote_white.svg
rename to en_us/css/vnote_white.svg
diff --git a/en_US/docs/_vnote.json b/en_us/docs/_vnote.json
similarity index 100%
rename from en_US/docs/_vnote.json
rename to en_us/docs/_vnote.json
diff --git a/en_US/donate.md b/en_us/donate.md
similarity index 93%
rename from en_US/donate.md
rename to en_us/donate.md
index b74b4e6a..47358f06 100644
--- a/en_US/donate.md
+++ b/en_us/donate.md
@@ -4,7 +4,7 @@ VNote is an open source and free project maintained by the author in part time.
 - Keep monitoring VNote and sending feedback for improvement.
 - Spread and promote VNote to your friends.
 - Participate in the development of VNote and send Pull Request to make VNote perfect.
-- Really appreciate your donate to VNote
+- Really appreciate your donate to VNote.
     - Alipay: `tamlokveer@gmail.com`  
     ![](_v_images/20181124165109541_999429459.png =256x)
     - WeChat  
diff --git a/en_US/downloads.md b/en_us/downloads.md
similarity index 100%
rename from en_US/downloads.md
rename to en_us/downloads.md
diff --git a/en_US/index.html b/en_us/index.html
similarity index 100%
rename from en_US/index.html
rename to en_us/index.html
diff --git a/en_US/index.md b/en_us/index.md
similarity index 100%
rename from en_US/index.md
rename to en_us/index.md
diff --git a/en_US/js/custom.js b/en_us/js/custom.js
similarity index 100%
rename from en_US/js/custom.js
rename to en_us/js/custom.js
diff --git a/en_US/js/viki.js b/en_us/js/viki.js
similarity index 100%
rename from en_US/js/viki.js
rename to en_us/js/viki.js
diff --git a/en_US/navigation.json b/en_us/navigation.json
similarity index 100%
rename from en_US/navigation.json
rename to en_us/navigation.json
diff --git a/en_US/resources/vnote.svg b/en_us/resources/vnote.svg
similarity index 100%
rename from en_US/resources/vnote.svg
rename to en_us/resources/vnote.svg
diff --git a/en_US/screenshots.md b/en_us/screenshots.md
similarity index 100%
rename from en_US/screenshots.md
rename to en_us/screenshots.md
diff --git a/en_US/viki.json b/en_us/viki.json
similarity index 100%
rename from en_US/viki.json
rename to en_us/viki.json
diff --git a/index.html b/index.html
index 3e8ead16..a3e94e2a 100644
--- a/index.html
+++ b/index.html
@@ -8,9 +8,9 @@
             var language = languageString.split(/[_-]/)[0].toLowerCase();
             switch (language) {
             case 'zh':
-                return "/zh_CN/";
+                return "zh_cn/";
             default:
-                return "/en_US/";
+                return "en_us/";
             }
         })();
         window.location.href = redir;
diff --git a/zh_CN/_vnote.json b/zh_cn/_vnote.json
similarity index 100%
rename from zh_CN/_vnote.json
rename to zh_cn/_vnote.json
diff --git a/zh_cn/index.html b/zh_cn/index.html
new file mode 100644
index 00000000..d5a12310
--- /dev/null
+++ b/zh_cn/index.html
@@ -0,0 +1,97 @@
+<!doctype html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+    <meta name="generator" content="Viki">
+
+    <title>Viki - A simple Wiki page in Markdown from notebook of VNote</title>
+    <link id="favicon" rel="icon" href="https://github.com/tamlok/viki/raw/master/resources/viki.ico">
+
+    <!-- Bootstrap CSS -->
+    <link href="https://cdn.bootcss.com/twitter-bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet">
+
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/jstree@3.3.7/dist/themes/default/style.min.css">
+
+    <link href="css/highlightjs.css" rel="stylesheet">
+    <link href="css/viki.css" rel="stylesheet">
+    <link href="css/custom.css" rel="stylesheet">
+
+    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
+    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
+    <script src="https://cdn.bootcss.com/popper.js/1.14.3/umd/popper.min.js"></script>
+    <script src="https://cdn.bootcss.com/twitter-bootstrap/4.1.3/js/bootstrap.min.js"></script>
+
+    <!--
+    <script src="https://cdn.bootcss.com/highlight.js/9.13.1/highlight.min.js"></script>
+    <script src="https://cdn.bootcss.com/highlight.js/9.13.1/languages/go.min.js"></script>
+    <script src="https://cdn.bootcss.com/highlight.js/9.13.1/languages/yaml.min.js"></script>
+    <script src="https://cdn.bootcss.com/highlight.js/9.13.1/languages/r.min.js"></script>
+    <script src="https://cdn.bootcss.com/highlight.js/9.13.1/languages/scala.min.js"></script>
+    <script src="https://cdn.bootcss.com/highlight.js/9.13.1/languages/shell.min.js"></script>
+    <script src="https://cdn.bootcss.com/highlight.js/9.13.1/languages/swift.min.js"></script>
+    <script src="https://cdn.bootcss.com/highlightjs-line-numbers.js/2.5.0/highlightjs-line-numbers.min.js"></script>
+    -->
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/highlight.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/languages/yaml.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/languages/go.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/languages/r.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/languages/scala.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/languages/swift.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/languages/shell.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/languages/powershell.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlightjs-line-numbers.js/2.5.0/highlightjs-line-numbers.min.js"></script>
+
+    <!--
+    <script src="https://cdn.bootcss.com/mermaid/8.0.0-rc.8/mermaid.min.js"></script>
+    -->
+    <script src="https://cdn.jsdelivr.net/npm/mermaid@8.0.0-rc.8/dist/mermaid.min.js"></script>
+
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/raphael/2.2.7/raphael.min.js"></script>
+    <!--
+    <script src="https://cdn.bootcss.com/flowchart/1.11.3/flowchart.min.js"></script>
+    -->
+    <script src="https://cdn.jsdelivr.net/npm/flowchart.js@1.11.3/release/flowchart.min.js"></script>
+
+    <!--
+    <script src="http://s.plantuml.com/synchro2.js"></script>
+    <script src="http://s.plantuml.com/zopfli.raw.min.js"></script>
+    -->
+
+    <script src="https://cdn.jsdelivr.net/npm/jstree@3.3.7/dist/jstree.min.js"></script>
+
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js?config=TeX-MML-AM_HTMLorMML" async></script>
+
+    <script type="text/x-mathjax-config">
+    MathJax.Hub.Config({
+        tex2jax: {
+            inlineMath: [['$','$'], ['\\(','\\)']],
+            processEscapes: true,
+            processClass: "tex2jax_process|language-mathjax|lang-mathjax"
+        },
+        showProcessingMessages: false,
+        skipStartupTypeset: true,
+        TeX: {
+            Macros: {
+                bm: ["\\boldsymbol{#1}", 1]
+            },
+            equationNumbers: {
+                autoNumber: "AMS"
+            }
+        },
+        messageStyle: "none"
+    });
+    MathJax.Hub.Register.StartupHook("End", function() {
+        if (typeof MathJaxReady != "undefined") {
+            MathJaxReady();
+        }
+    });
+    </script>
+
+    <!-- viki script -->
+    <script src="js/viki.js"></script>
+    <script src="js/custom.js"></script>
+</head>
+<body>
+</body>
+</html>