diff --git a/.github/workflows/cos.yaml b/.github/workflows/cos.yaml
new file mode 100644
index 0000000..f79e709
--- /dev/null
+++ b/.github/workflows/cos.yaml
@@ -0,0 +1,41 @@
+name: update to cos
+
+on: 
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+        
+    steps:
+    - name: checkout
+      uses: actions/checkout@master
+
+    - name: install dependencies
+      run: |
+        sudo pip install coscmd
+        sudo pip install tccli
+        npm i
+    
+    - name: build
+      run: |
+        npm run docs:build
+
+    - name: confirgure coscmd and tccli
+      env:
+        SECRET_ID: ${{ secrets.TCLOUD_API_ID }}
+        SECRET_KEY: ${{ secrets.TCLOUD_API_KEY }}
+        BUCKET: hdu-cs-wiki-1307923872
+        REGION: ap-shanghai
+      run: |
+        coscmd config -a $SECRET_ID -s $SECRET_KEY -b $BUCKET -r $REGION
+        tccli configure set secretId $SECRET_ID
+        tccli configure set secretKey $SECRET_KEY
+        tccli configure set region $REGION
+
+    - name: upload and refresh cdn
+      run: |
+        coscmd upload -rfs --delete ./.vitepress/dist/ /
+        tccli cdn PurgePathCache --cli-unfold-argument --Paths https://wiki.xyxsw.site/ --FlushType flush
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