diff --git a/package.json b/package.json
index 044644a..4625852 100644
--- a/package.json
+++ b/package.json
@@ -7,9 +7,9 @@
     "dev": "max dev",
     "build": "max build",
     "deploy": "npm run build && npm run gh-pages",
-    "preview": "npm run build && max preview --port 8000",
+    "preview": "npm run build && max preview --port 5004",
     "serve": "umi-serve",
-    "start": "npm run dev",
+    "start": "npm run dev -- --port 5004",
     "start:dev": "cross-env REACT_APP_ENV=dev MOCK=none UMI_ENV=dev max dev",
     "start:no-mock": "cross-env MOCK=none UMI_ENV=dev max dev",
     "start:pre": "cross-env REACT_APP_ENV=pre UMI_ENV=dev max dev",