diff --git a/deploy/install.sh b/deploy/install.sh
index 72b19e8..18db52a 100644
--- a/deploy/install.sh
+++ b/deploy/install.sh
@@ -277,6 +277,7 @@ print_summary() {
   echo ""
   echo "  主程序:   systemctl status grade-archive"
   echo "  更新:     sudo bash ${INSTALL_DIR}/deploy/update.sh"
+  echo "  卸载:     sudo bash ${INSTALL_DIR}/deploy/uninstall.sh"
   echo "  微信 dekun03  手机 18364911125"
   echo "=========================================="
 }
diff --git a/deploy/uninstall.sh b/deploy/uninstall.sh
index 36de569..09c73e2 100644
--- a/deploy/uninstall.sh
+++ b/deploy/uninstall.sh
@@ -1,11 +1,124 @@
 #!/usr/bin/env bash
+#
+# 卸载中学成绩档案系统（停止服务 + 可选删除数据/目录）
+# 用法:
+#   sudo bash deploy/uninstall.sh              # 停止服务，保留代码/数据库/上传
+#   sudo bash deploy/uninstall.sh --purge        # 额外删除 /opt/secondary-school-grade-archive
+#   sudo bash deploy/uninstall.sh --purge-db     # 额外删除 PostgreSQL 库与用户
+#   sudo bash deploy/uninstall.sh --purge --purge-db  # 完全清除后重装
+#
 set -euo pipefail
 
 INSTALL_DIR="${INSTALL_DIR:-/opt/secondary-school-grade-archive}"
+OCR_SCREEN_NAME="${OCR_SCREEN_NAME:-ocr-worker}"
 
-cd "${INSTALL_DIR}" || exit 1
-pm2 delete grade-api grade-web 2>/dev/null || true
-pm2 save --force
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
 
-echo "PM2 服务已停止。PostgreSQL 数据与 ${INSTALL_DIR}/uploads 仍保留。"
-echo "如需删除源码: rm -rf ${INSTALL_DIR}"
+log_info()  { echo -e "${GREEN}[INFO]${NC} $*"; }
+log_warn()  { echo -e "${YELLOW}[WARN]${NC} $*"; }
+log_error() { echo -e "${RED}[ERROR]${NC} $*" >&2; }
+
+PURGE_DIR=0
+PURGE_DB=0
+for arg in "$@"; do
+  case "${arg}" in
+    --purge) PURGE_DIR=1 ;;
+    --purge-db) PURGE_DB=1 ;;
+    -h|--help)
+      sed -n '2,8p' "$0"
+      exit 0
+      ;;
+  esac
+done
+
+if [[ "${EUID:-$(id -u)}" -ne 0 ]]; then
+  log_error "请使用 root: sudo bash deploy/uninstall.sh"
+  exit 1
+fi
+
+if [[ -f "${INSTALL_DIR}/.env" ]]; then
+  # shellcheck disable=SC1090
+  set -a && source "${INSTALL_DIR}/.env" && set +a
+fi
+
+POSTGRES_USER="${POSTGRES_USER:-gradeapp}"
+POSTGRES_DB="${POSTGRES_DB:-student_archive}"
+
+echo ""
+echo "=========================================="
+echo "  卸载中学成绩档案系统"
+echo "=========================================="
+echo "  安装目录: ${INSTALL_DIR}"
+echo "  删除目录: $([[ ${PURGE_DIR} -eq 1 ]] && echo 是 || echo 否（保留）)"
+echo "  删除数据库: $([[ ${PURGE_DB} -eq 1 ]] && echo 是 || echo 否（保留）)"
+echo "=========================================="
+echo ""
+
+if [[ -t 0 ]]; then
+  read -rp "确认继续? [y/N] " confirm
+  if [[ "${confirm}" != [yY] ]]; then
+    echo "已取消"
+    exit 0
+  fi
+fi
+
+log_info "停止主程序 systemd…"
+systemctl stop grade-archive 2>/dev/null || true
+systemctl disable grade-archive 2>/dev/null || true
+rm -f /etc/systemd/system/grade-archive.service
+systemctl daemon-reload
+
+log_info "停止 OCR Worker systemd（若曾安装）…"
+systemctl stop ocr-worker 2>/dev/null || true
+systemctl disable ocr-worker 2>/dev/null || true
+rm -f /etc/systemd/system/ocr-worker.service
+systemctl daemon-reload
+
+log_info "停止 OCR screen 会话…"
+if command -v screen >/dev/null; then
+  screen -S "${OCR_SCREEN_NAME}" -X quit 2>/dev/null || true
+fi
+
+log_info "停止旧版 PM2（若存在）…"
+if command -v pm2 >/dev/null; then
+  pm2 delete grade-api grade-web 2>/dev/null || true
+  pm2 save --force 2>/dev/null || true
+fi
+
+if [[ ${PURGE_DB} -eq 1 ]]; then
+  if command -v psql >/dev/null && systemctl is-active postgresql &>/dev/null; then
+    log_info "删除 PostgreSQL 数据库 ${POSTGRES_DB}…"
+    sudo -u postgres psql -c "DROP DATABASE IF EXISTS \"${POSTGRES_DB}\";" 2>/dev/null || true
+    sudo -u postgres psql -c "DROP USER IF EXISTS \"${POSTGRES_USER}\";" 2>/dev/null || true
+  else
+    log_warn "PostgreSQL 未运行，跳过删库"
+  fi
+fi
+
+if [[ ${PURGE_DIR} -eq 1 ]]; then
+  log_info "删除安装目录 ${INSTALL_DIR}…"
+  rm -rf "${INSTALL_DIR}"
+else
+  log_info "保留安装目录（含 uploads、.env、数据库文件若未 --purge-db）"
+fi
+
+echo ""
+echo "=========================================="
+echo "  卸载完成"
+echo "=========================================="
+if [[ ${PURGE_DIR} -eq 0 ]]; then
+  echo "  代码仍在: ${INSTALL_DIR}"
+  echo "  重新部署:"
+  echo "    cd ${INSTALL_DIR} && git pull"
+  echo "    export OLLAMA_BASE_URL=http://Ollama电脑IP:11434"
+  echo "    sudo bash deploy/install.sh"
+else
+  echo "  重新部署（全新）:"
+  echo "    export OLLAMA_BASE_URL=http://Ollama电脑IP:11434"
+  echo "    sudo bash deploy/install.sh"
+  echo "  （install.sh 会自动 git clone 到 ${INSTALL_DIR}）"
+fi
+echo "=========================================="