diff --git a/.github/workflows/ci-cd.yaml b/.github/workflows/ci-cd.yaml
index c581fc5..fe9b45b 100644
--- a/.github/workflows/ci-cd.yaml
+++ b/.github/workflows/ci-cd.yaml
@@ -1,5 +1,6 @@
 name: CI/CD Pipeline
 
+# 当代码推送到 main 分支时触发工作流
 on:
   push:
     branches:
@@ -7,47 +8,56 @@ on:
 
 jobs:
   build-and-deploy:
+    # 使用最新的 Ubuntu 版本作为运行环境
     runs-on: ubuntu-latest
 
+    # 定义环境变量
     env:
-      BACKEND_IMAGE: ${{ vars.DOCKER_USERNAME }}/k8s-backend:1.0
-      FRONTEND_IMAGE: ${{ vars.DOCKER_USERNAME }}/k8s-frontend:1.0
+      BACKEND_IMAGE: ${{ secrets.DOCKER_USERNAME }}/k8s-backend:1.0
+      FRONTEND_IMAGE: ${{ secrets.DOCKER_USERNAME }}/k8s-frontend:1.0
 
     steps:
+      # 从 GitHub 仓库中检出代码
       - name: Checkout code
         uses: actions/checkout@v2
 
+      # 设置 Docker Buildx 环境，以支持多平台构建
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
 
+      # 登录到 Docker Hub，使用 GitHub 变量中的 Docker 用户名和 GitHub Secrets 中的 Docker 密码
       - name: Login to DockerHub
         uses: docker/login-action@v1
         with:
-          username: ${{ vars.DOCKER_USERNAME }}
+          username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
+      # 构建并推送后端 Docker 镜像
       - name: Build and push backend image
         run: |
           cd k8s-backend
           docker build -t $BACKEND_IMAGE .
           docker push $BACKEND_IMAGE
 
+      # 构建并推送前端 Docker 镜像
       - name: Build and push frontend image
         run: |
           cd k8s-frontend
           docker build -t $FRONTEND_IMAGE .
           docker push $FRONTEND_IMAGE
 
+      # 安装和设置 kubectl 工具，指定安装最新版本的 kubectl
       - name: Set up kubectl
         uses: azure/setup-kubectl@v1
         with:
           version: 'latest'
 
+# 部署到 Kubernetes 集群，使用 GitHub Secrets 中的 KUBECONFIG 环境变量，并替换部署文件中的 Docker Hub 用户名
 #      - name: Deploy to Kubernetes
 #        env:
 #          KUBECONFIG: ${{ secrets.KUBECONFIG }}
 #        run: |
-#          sed -i "s|<your_docker_hub_username>|${{ vars.DOCKER_USERNAME }}|g" k8s-backend/backend-deployment.yaml
-#          sed -i "s|<your_docker_hub_username>|${{ vars.DOCKER_USERNAME }}|g" k8s-frontend/frontend-deployment.yaml
+#          sed -i "s|<your_docker_hub_username>|${{ secrets.DOCKER_USERNAME }}|g" k8s-backend/backend-deployment.yaml
+#          sed -i "s|<your_docker_hub_username>|${{ secrets.DOCKER_USERNAME }}|g" k8s-frontend/frontend-deployment.yaml
 #          kubectl apply -f k8s-backend/backend-deployment.yaml
 #          kubectl apply -f k8s-frontend/frontend-deployment.yaml