diff --git a/install.sh b/install.sh
index 1c6146b..a85e933 100644
--- a/install.sh
+++ b/install.sh
@@ -12,9 +12,54 @@ die() { printf '\033[1;31m错误:\033[0m %s\n' "$*" >&2; exit 1; }
 
 [ "$(uname)" = "Linux" ] || [ "$(uname)" = "Darwin" ] || die "此脚本仅支持 Linux / macOS"
 
-# ---------- 依赖 ----------
-need_py() {
-  command -v python3 >/dev/null 2>&1 || die "未找到 python3,请先安装 Python 3.10+"
+# ---------- 系统包管理器 ----------
+PKG_MGR=""
+for m in apt-get dnf yum zypper pacman apk; do
+  command -v "$m" >/dev/null 2>&1 && { PKG_MGR="$m"; break; }
+done
+
+as_root() {
+  if [ "$(id -u)" = 0 ]; then "$@"
+  elif command -v sudo >/dev/null 2>&1; then sudo "$@"
+  else die "需要 root 权限但未找到 sudo,请手动安装后重试"; fi
+}
+
+# 各发行版补齐 python3+venv 所需的包
+py_pkgs() {
+  case "$PKG_MGR" in
+    apt-get) echo "python3 python3-venv" ;;
+    dnf|yum) echo "python3 python3-pip" ;;
+    zypper)  echo "python3 python3-pip" ;;
+    pacman)  echo "python python-pip" ;;
+    apk)     echo "python3 py3-pip py3-virtualenv" ;;
+    *)       echo "" ;;
+  esac
+}
+
+pkg_install() {
+  [ -n "$PKG_MGR" ] || return 1
+  say "自动安装系统依赖($PKG_MGR): $* — 可能要求输入密码"
+  case "$PKG_MGR" in
+    apt-get) as_root apt-get update -qq >/dev/null 2>&1 || true; as_root apt-get install -y "$@" ;;
+    dnf)     as_root dnf install -y -q "$@" ;;
+    yum)     as_root yum install -y -q "$@" ;;
+    zypper)  as_root zypper --non-interactive install "$@" ;;
+    pacman)  as_root pacman -S --noconfirm --needed "$@" ;;
+    apk)     as_root apk add "$@" ;;
+  esac
+}
+
+# ---------- Python 检查 + 自动补齐 ----------
+ensure_python() {
+  if ! command -v python3 >/dev/null 2>&1; then
+    say "未找到 python3,尝试自动安装 ..."
+    pkgs="$(py_pkgs)"
+    [ -n "$pkgs" ] || die "未识别到包管理器,请手动安装 Python 3.10+ 后重试"
+    pkg_install $pkgs || die "自动安装 Python 失败,请手动安装后重试"
+    command -v python3 >/dev/null 2>&1 || die "python3 仍不可用,请手动安装"
+  fi
+
+  local pyver
   pyver=$(python3 -c 'import sys;print("%d.%d"%sys.version_info[:2])')
   case "$pyver" in
     3.1[0-9]|3.[2-9][0-9]|[4-9].*) ;;
@@ -22,6 +67,19 @@ need_py() {
   esac
 }
 
+ensure_venv() {
+  if python3 -c "import ensurepip" >/dev/null 2>&1; then return 0; fi
+  say "系统 Python 缺少 venv/ensurepip 组件,尝试自动安装 ..."
+  pkgs="$(py_pkgs)"
+  [ -n "$pkgs" ] || die "当前平台无包管理器可自动补齐(如 macOS 可执行: xcode-select --install 或 brew install python)"
+  pkg_install $pkgs || die "自动安装 venv 组件失败,请手动执行后重试"
+  python3 -c "import ensurepip" >/dev/null 2>&1 \
+    || die "venv 组件仍未就绪,请手动安装(Debian/Ubuntu: sudo apt install python3-venv)"
+}
+
+ensure_python
+ensure_venv
+
 # ---------- 下载源码 ----------
 say "下载最新代码到 $APP_DIR ..."
 mkdir -p "$APP_DIR"
@@ -43,13 +101,14 @@ if [ ! -f "$APP_DIR/cli.py" ]; then
 fi
 [ -f "$APP_DIR/cli.py" ] || die "代码下载失败,请检查网络后重试"
 
-# ---------- 虚拟环境 ----------
-if [ ! -x "$APP_DIR/.venv/bin/python" ]; then
+# ---------- 虚拟环境(不完整则整体重建) ----------
+if [ ! -f "$APP_DIR/.venv/deps-done" ]; then
+  rm -rf "$APP_DIR/.venv"
   say "创建虚拟环境并安装依赖(首次约 1-2 分钟)..."
-  need_py
-  python3 -m venv "$APP_DIR/.venv"
-fi
-if [ ! -e "$APP_DIR/.venv/deps-done" ]; then
+  python3 -m venv "$APP_DIR/.venv" || {
+    rm -rf "$APP_DIR/.venv"
+    die "虚拟环境创建失败(Debian/Ubuntu 可执行: sudo apt install python3-venv)"
+  }
   "$APP_DIR/.venv/bin/pip" install --quiet --disable-pip-version-check \
     paramiko cryptography keyring > /dev/null
   touch "$APP_DIR/.venv/deps-done"