diff --git a/.tools/templates/index.html.tmpl b/.tools/templates/index.html.tmpl
index 2762bc0a7bb15f0260d35d9571429171d972657c..19b52dd7edfad3f8eb36b847326cf57d5e255405 100644
--- a/.tools/templates/index.html.tmpl
+++ b/.tools/templates/index.html.tmpl
@@ -78,12 +78,12 @@
             </a>
           </li>
           <li class="nav-item {% if not is_en %}active{% endif %}">
-            <a class="nav-link" href="{% if is_en %}./index.html{% else %}#{%endif%}">
+            <a class="nav-link" href="{% if is_en %}./index.cn.html{% else %}#{%endif%}">
                 {% if is_en %}中文{% else %}深度学习入门{% endif %}
             </a>
           </li>
           <li class="nav-item {% if is_en %}active{% endif %}">
-            <a class="nav-link" href="{% if is_en %}#{% else %}./index.en.html{% endif %}">
+            <a class="nav-link" href="{% if is_en %}#{% else %}./index.html{% endif %}">
                 {% if is_en %}Deep Learning 101{% else %}English{% endif %}
             </a>
           </li>
@@ -119,7 +119,7 @@
                 </div>
             </div>
             <div class="col">
-                <iframe src="./01.fit_a_line/index{% if is_en %}.en{% endif %}.html" style="border: none; overflow-y : hidden" width="100%" height="100%" name="content_iframe" id="content_iframe">
+                <iframe src="./01.fit_a_line/index{% if not is_en %}.cn{% endif %}.html" style="border: none; overflow-y : hidden" width="100%" height="100%" name="content_iframe" id="content_iframe">
                 </iframe>
             </div>
         </div>
diff --git a/index.cn.html b/index.cn.html
index 55e1c0a1a1cb98cd172b93ad8de08f21d4c6e477..f60aef0bb7a0a93754c76f9a1a8477b6a571a1a5 100644
--- a/index.cn.html
+++ b/index.cn.html
@@ -83,7 +83,7 @@
             </a>
           </li>
           <li class="nav-item ">
-            <a class="nav-link" href="./index.en.html">
+            <a class="nav-link" href="./index.html">
                 English
             </a>
           </li>
@@ -147,7 +147,7 @@
                 </div>
             </div>
             <div class="col">
-                <iframe src="./01.fit_a_line/index.html" style="border: none; overflow-y : hidden" width="100%" height="100%" name="content_iframe" id="content_iframe">
+                <iframe src="./01.fit_a_line/index.cn.html" style="border: none; overflow-y : hidden" width="100%" height="100%" name="content_iframe" id="content_iframe">
                 </iframe>
             </div>
         </div>
diff --git a/index.html b/index.html
index 8b84d29773760b30651997507ee097ffa80d2f68..d23324634e13dcf56a87ab5b45c2404e141bec71 100644
--- a/index.html
+++ b/index.html
@@ -74,7 +74,7 @@
             </a>
           </li>
           <li class="nav-item ">
-            <a class="nav-link" href="./index.html">
+            <a class="nav-link" href="./index.cn.html">
                 中文
             </a>
           </li>
@@ -143,7 +143,7 @@
                 </div>
             </div>
             <div class="col">
-                <iframe src="./01.fit_a_line/index.en.html" style="border: none; overflow-y : hidden" width="100%" height="100%" name="content_iframe" id="content_iframe">
+                <iframe src="./01.fit_a_line/index.html" style="border: none; overflow-y : hidden" width="100%" height="100%" name="content_iframe" id="content_iframe">
                 </iframe>
             </div>
         </div>