diff --git a/aio/content/navigation.json b/aio/content/navigation.json
index 080fd8f888..9589e77ed1 100644
--- a/aio/content/navigation.json
+++ b/aio/content/navigation.json
@@ -23,12 +23,6 @@
     {
       "url": "translations/cn/home",
       "title": "关于中文版"
-    },
-    {
-      "title": "2019 ngChina @ 杭州",
-      "tooltip": "2019 ngChina 开发者大会",
-      "url": "https://ng-china.org",
-      "highlight": true
     }
   ],
   "TopBarNarrow": [
@@ -777,11 +771,6 @@
       "tooltip": "分割线",
       "divider": true
     },
-    {
-      "title": "2019 ngChina @ 杭州",
-      "tooltip": "2019 ngChina 开发者大会",
-      "url": "https://ng-china.org"
-    },
     {
       "title": "互助问答",
       "tooltip": "github 上的中文互助问答区",
diff --git a/aio/package.json b/aio/package.json
index 08430aac85..6373637c26 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -12,7 +12,7 @@
     "aio-use-npm": "node tools/ng-packages-installer restore .",
     "aio-check-local": "node tools/ng-packages-installer check .",
     "ng": "yarn check-env && ng",
-    "start": "yarn check-env && ng serve --configuration=fast",
+    "start": "yarn check-env && ng serve --configuration=fast --port=4201",
     "preview": "http-server-spa ./dist index.html 4200",
     "prebuild": "yarn setup",
     "build": "yarn ~~build",