diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index f585b47..b9bc7e3 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -10,11 +10,15 @@ jobs:
     steps:
       - name: 安装 Docker CLI
         run: |
-          # 替换 Debian 源为清华镜像，避免国内连 deb.debian.org 超时
-          sed -i 's|deb.debian.org|mirrors.tuna.tsinghua.edu.cn|g' /etc/apt/sources.list /etc/apt/sources.list.d/*.list 2>/dev/null || true
-          sed -i 's|security.debian.org|mirrors.tuna.tsinghua.edu.cn/debian-security|g' /etc/apt/sources.list /etc/apt/sources.list.d/*.list 2>/dev/null || true
-          apt-get update -qq
-          apt-get install -y -qq docker.io
+          # 大概率 gitea act_runner 已预装 docker，先探测（避免 apt 走国外源 3h 超时）
+          if command -v docker >/dev/null 2>&1; then
+            echo "Docker 已预装：$(docker --version)"
+            exit 0
+          fi
+          echo "Docker 未预装，开始 apt 安装（每步限时 3 分钟，超时快速失败）"
+          timeout 60 apt-get update -qq || { echo "apt-get update 超时/失败"; exit 1; }
+          timeout 180 apt-get install -y -qq docker.io || { echo "docker.io 安装超时/失败"; exit 1; }
+          docker --version
 
       - name: 拉取代码
         uses: actions/checkout@v4