diff --git a/README.md b/README.md
index 91bf9be..e11ae84 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,17 @@ VERSION=v0.1.0 curl -sSL https://git.littlediary.cn/CN-JS-HuiBai/PromdataPanel/r
 3. 安装依赖：`npm install --production`
 4. 启动服务：`npm start`
 
+### 方式三：更新现有版本
+
+如果您已经安装了本系统，可以使用随附的 `update.sh` 脚本一键升级到最新代码：
+
+```bash
+# 进入程序目录
+cd /opt/promdata-panel
+# 执行更新脚本
+chmod +x update.sh && ./update.sh
+```
+
 #### 3. 系统初始化
 首次运行后，访问 `http://your-ip:3000/init.html`，按照引导完成 MySQL 数据库和 Valkey 缓存的连接。
 
diff --git a/update.sh b/update.sh
new file mode 100644
index 0000000..ea7a4b5
--- /dev/null
+++ b/update.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+
+# Update Script for PromdataPanel
+# -------------------------------
+
+set -e
+
+# Config
+APP_DIR="/opt/promdata-panel"
+SERVICE_NAME="promdatapanel"
+
+# 1. Colors for logs
+GREEN='\033[0;32m'
+BLUE='\033[0;34m'
+RED='\033[0;31m'
+NC='\033[0m' # No Color
+
+echo -e "${BLUE}=== Starting PromdataPanel Update ===${NC}"
+
+# Detect if we're in the app directory
+if [ ! -d ".git" ]; then
+    if [ -d "$APP_DIR/.git" ]; then
+        cd "$APP_DIR"
+    else
+        echo -e "${RED}Error: Not in a git repository or $APP_DIR. Please run this from the app root.${NC}"
+        exit 1
+    fi
+fi
+
+# 2. Pull latest code from current branch
+echo -e "${BLUE}Pulling latest code from git...${NC}"
+git pull
+
+# 3. Update dependencies
+echo -e "${BLUE}Updating npm dependencies...${NC}"
+npm install --production
+
+# 4. Restart service
+if systemctl is-active --quiet "$SERVICE_NAME"; then
+    echo -e "${BLUE}Restarting systemd service: $SERVICE_NAME...${NC}"
+    sudo systemctl restart "$SERVICE_NAME"
+    echo -e "${GREEN}Update completed and service restarted!${NC}"
+elif command -v pm2 &> /dev/null && pm2 list | grep -q "$SERVICE_NAME"; then
+    echo -e "${BLUE}Restarting with PM2...${NC}"
+    pm2 restart "$SERVICE_NAME"
+    echo -e "${GREEN}Update completed and PM2 restarted!${NC}"
+else
+    echo -e "${RED}Warning: Could not detect an active systemd service or PM2 process named '$SERVICE_NAME'.${NC}"
+    echo -e "${RED}Please restart the application manually.${NC}"
+fi
+
+echo -e "${GREEN}=== Update successfully finished ===${NC}"