diff --git a/setup_cups.sh b/setup_cups.sh
index 3662471..ca7eecb 100755
--- a/setup_cups.sh
+++ b/setup_cups.sh
@@ -160,6 +160,254 @@ get_ip() {
     ip addr show | grep -oP '(?<=inet\s)\d+(\.\d+){3}' | grep -v '127.0.0.1' | head -n1
 }
 
+# 获取默认网关
+get_gateway() {
+    ip route | grep default | awk '{print $3}' | head -n1
+}
+
+# 获取主网络接口名称
+get_interface() {
+    ip route | grep default | awk '{print $5}' | head -n1
+}
+
+# 获取子网掩码（CIDR格式）
+get_netmask() {
+    local iface=$(get_interface)
+    ip addr show "$iface" | grep -oP 'inet \K[\d.]+/\d+' | head -n1 | cut -d'/' -f2
+}
+
+# 获取DNS服务器
+get_dns() {
+    # 尝试从 resolv.conf 获取
+    grep -E "^nameserver" /etc/resolv.conf 2>/dev/null | awk '{print $2}' | head -n2 | tr '\n' ' '
+}
+
+# 配置静态IP
+configure_static_ip() {
+    echo ""
+    echo -e "${YELLOW}═══════════════════════════════════════════════════════════${NC}"
+    echo -e "${YELLOW}                   配置静态 IP 地址                        ${NC}"
+    echo -e "${YELLOW}═══════════════════════════════════════════════════════════${NC}"
+    echo ""
+
+    local current_ip=$(get_ip)
+    local current_gateway=$(get_gateway)
+    local current_interface=$(get_interface)
+    local current_netmask=$(get_netmask)
+    local current_dns=$(get_dns)
+
+    echo -e "${BLUE}当前网络配置:${NC}"
+    echo "  接口名称: $current_interface"
+    echo "  IP 地址:  $current_ip"
+    echo "  子网掩码: /$current_netmask"
+    echo "  网关:     $current_gateway"
+    echo "  DNS:      $current_dns"
+    echo ""
+
+    # 询问是否使用当前IP
+    echo -e "${YELLOW}是否将当前 IP ($current_ip) 设置为静态 IP？${NC}"
+    echo "  Y - 使用当前 IP"
+    echo "  N - 手动输入新 IP"
+    echo ""
+    read -p "选择 [Y/n]: " use_current < /dev/tty
+    use_current=${use_current:-Y}
+
+    local static_ip=""
+    local static_gateway=""
+    local static_netmask=""
+    local static_dns=""
+
+    if [[ "$use_current" =~ ^[Yy]$ ]]; then
+        static_ip="$current_ip"
+        static_gateway="$current_gateway"
+        static_netmask="$current_netmask"
+        static_dns="${current_dns:-8.8.8.8 114.114.114.114}"
+    else
+        echo ""
+        read -p "请输入静态 IP 地址 (如 192.168.1.100): " static_ip < /dev/tty
+        read -p "请输入子网掩码 (如 24，表示255.255.255.0): " static_netmask < /dev/tty
+        read -p "请输入网关地址 (如 192.168.1.1): " static_gateway < /dev/tty
+        read -p "请输入 DNS 服务器 (如 8.8.8.8 114.114.114.114): " static_dns < /dev/tty
+
+        static_netmask=${static_netmask:-24}
+        static_dns=${static_dns:-"8.8.8.8 114.114.114.114"}
+    fi
+
+    # 检查是否使用 NetworkManager
+    if systemctl is-active --quiet NetworkManager 2>/dev/null; then
+        configure_static_ip_networkmanager "$current_interface" "$static_ip" "$static_netmask" "$static_gateway" "$static_dns"
+    # 检查是否使用 netplan (Ubuntu 18.04+)
+    elif [ -d /etc/netplan ]; then
+        configure_static_ip_netplan "$current_interface" "$static_ip" "$static_netmask" "$static_gateway" "$static_dns"
+    # 使用传统的 /etc/network/interfaces
+    else
+        configure_static_ip_interfaces "$current_interface" "$static_ip" "$static_netmask" "$static_gateway" "$static_dns"
+    fi
+}
+
+# 使用 NetworkManager 配置静态IP
+configure_static_ip_networkmanager() {
+    local iface=$1
+    local ip=$2
+    local mask=$3
+    local gw=$4
+    local dns=$5
+
+    info "检测到 NetworkManager，使用 nmcli 配置..."
+
+    # 获取连接名称
+    local conn_name=$(nmcli -t -f NAME,DEVICE con show --active | grep "$iface" | cut -d':' -f1)
+
+    if [ -z "$conn_name" ]; then
+        conn_name="$iface"
+    fi
+
+    # 配置静态IP
+    nmcli con mod "$conn_name" ipv4.method manual
+    nmcli con mod "$conn_name" ipv4.addresses "$ip/$mask"
+    nmcli con mod "$conn_name" ipv4.gateway "$gw"
+    nmcli con mod "$conn_name" ipv4.dns "$dns"
+
+    # 重启连接
+    nmcli con down "$conn_name" 2>/dev/null || true
+    nmcli con up "$conn_name"
+
+    success "NetworkManager 静态 IP 配置完成"
+}
+
+# 使用 netplan 配置静态IP
+configure_static_ip_netplan() {
+    local iface=$1
+    local ip=$2
+    local mask=$3
+    local gw=$4
+    local dns=$5
+
+    info "检测到 netplan，创建静态 IP 配置..."
+
+    # 备份现有配置
+    for f in /etc/netplan/*.yaml; do
+        if [ -f "$f" ]; then
+            cp "$f" "$f.bak"
+            info "已备份: $f -> $f.bak"
+        fi
+    done
+
+    # 转换DNS格式
+    local dns_list=""
+    for d in $dns; do
+        dns_list="$dns_list, $d"
+    done
+    dns_list=$(echo "$dns_list" | sed 's/^, //')
+
+    # 创建新的netplan配置
+    cat > /etc/netplan/01-static-ip.yaml << EOF
+# 静态 IP 配置 - 由 CUPS 一键脚本生成
+network:
+  version: 2
+  renderer: networkd
+  ethernets:
+    $iface:
+      dhcp4: no
+      addresses:
+        - $ip/$mask
+      routes:
+        - to: default
+          via: $gw
+      nameservers:
+        addresses: [$dns_list]
+EOF
+
+    # 删除其他可能冲突的配置
+    for f in /etc/netplan/*.yaml; do
+        if [ "$f" != "/etc/netplan/01-static-ip.yaml" ] && [ -f "$f" ]; then
+            rm -f "$f"
+            info "移除冲突配置: $f"
+        fi
+    done
+
+    # 应用配置
+    info "应用 netplan 配置..."
+    netplan apply
+
+    success "Netplan 静态 IP 配置完成"
+}
+
+# 使用传统 interfaces 文件配置静态IP
+configure_static_ip_interfaces() {
+    local iface=$1
+    local ip=$2
+    local mask=$3
+    local gw=$4
+    local dns=$5
+
+    info "使用传统 /etc/network/interfaces 配置..."
+
+    # 备份原配置
+    if [ -f /etc/network/interfaces ]; then
+        cp /etc/network/interfaces /etc/network/interfaces.bak
+        info "已备份: /etc/network/interfaces -> /etc/network/interfaces.bak"
+    fi
+
+    # 将CIDR转换为子网掩码
+    local netmask=""
+    case $mask in
+        8)  netmask="255.0.0.0" ;;
+        16) netmask="255.255.0.0" ;;
+        24) netmask="255.255.255.0" ;;
+        25) netmask="255.255.255.128" ;;
+        26) netmask="255.255.255.192" ;;
+        27) netmask="255.255.255.224" ;;
+        28) netmask="255.255.255.240" ;;
+        29) netmask="255.255.255.248" ;;
+        30) netmask="255.255.255.252" ;;
+        *)  netmask="255.255.255.0" ;;
+    esac
+
+    # 创建新配置
+    cat > /etc/network/interfaces << EOF
+# 静态 IP 配置 - 由 CUPS 一键脚本生成
+# 备份文件: /etc/network/interfaces.bak
+
+# 本地回环接口
+auto lo
+iface lo inet loopback
+
+# 主网络接口 - 静态IP
+auto $iface
+iface $iface inet static
+    address $ip
+    netmask $netmask
+    gateway $gw
+    dns-nameservers $dns
+EOF
+
+    # 重启网络服务
+    info "重启网络服务..."
+    systemctl restart networking 2>/dev/null || /etc/init.d/networking restart 2>/dev/null || true
+
+    success "传统网络配置完成"
+}
+
+# 显示静态IP配置结果
+show_static_ip_result() {
+    local new_ip=$(get_ip)
+    local new_gateway=$(get_gateway)
+    local new_interface=$(get_interface)
+
+    echo ""
+    echo -e "${GREEN}╔══════════════════════════════════════════════════════════╗${NC}"
+    echo -e "${GREEN}║              静态 IP 配置完成!                           ║${NC}"
+    echo -e "${GREEN}╚══════════════════════════════════════════════════════════╝${NC}"
+    echo ""
+    echo -e "  ${BLUE}网络接口:${NC} $new_interface"
+    echo -e "  ${BLUE}静态 IP:${NC}  $new_ip"
+    echo -e "  ${BLUE}网关:${NC}     $new_gateway"
+    echo ""
+    echo -e "  ${YELLOW}注意:${NC} IP 地址已固定，重启后不会改变"
+    echo ""
+}
+
 # 显示欢迎信息
 show_banner() {
     clear
@@ -421,19 +669,37 @@ main() {
     change_mirror=${change_mirror:-Y}
     echo ""
 
+    # 询问是否配置静态IP
+    echo -e "${YELLOW}是否将当前 IP 配置为静态 IP？${NC}"
+    echo "  推荐：选择 Y，避免 IP 变化导致无法连接打印服务器"
+    echo "  当前 IP: ${LOCAL_IP}"
+    echo ""
+    read -p "配置静态 IP? [Y/n]: " config_static_ip < /dev/tty
+    config_static_ip=${config_static_ip:-Y}
+    echo ""
+
     # 确认安装
     echo -e "${YELLOW}即将执行以下操作:${NC}"
+    local step=1
     if [[ "$change_mirror" =~ ^[Yy]$ ]]; then
-        echo "  1. 更换为国内软件源（清华大学）"
-        echo "  2. 更新系统软件源"
-    else
-        echo "  1. 更新系统软件源"
+        echo "  $step. 更换为国内软件源（清华大学）"
+        ((step++))
     fi
-    echo "  3. 安装 CUPS 和 Avahi"
-    echo "  4. 安装打印机驱动"
-    echo "  5. 配置 CUPS 允许局域网访问"
-    echo "  6. 将当前用户添加到 lpadmin 组"
-    echo "  7. 启动并设置开机自启"
+    echo "  $step. 更新系统软件源"
+    ((step++))
+    if [[ "$config_static_ip" =~ ^[Yy]$ ]]; then
+        echo "  $step. 配置静态 IP 地址 (${LOCAL_IP})"
+        ((step++))
+    fi
+    echo "  $step. 安装 CUPS 和 Avahi"
+    ((step++))
+    echo "  $step. 安装打印机驱动"
+    ((step++))
+    echo "  $step. 配置 CUPS 允许局域网访问"
+    ((step++))
+    echo "  $step. 将当前用户添加到 lpadmin 组"
+    ((step++))
+    echo "  $step. 启动并设置开机自启"
     echo ""
     read -p "是否继续? [Y/n]: " confirm < /dev/tty
     confirm=${confirm:-Y}
@@ -457,7 +723,12 @@ main() {
     apt update
     success "软件源更新完成"
 
-    # 2. 安装 CUPS 和 Avahi
+    # 3. 配置静态IP（如果选择）
+    if [[ "$config_static_ip" =~ ^[Yy]$ ]]; then
+        configure_static_ip
+    fi
+
+    # 4. 安装 CUPS 和 Avahi
     info "安装 CUPS 和 Avahi..."
     apt install -y cups avahi-daemon wget unzip
     success "CUPS 和 Avahi 安装完成"
@@ -515,12 +786,19 @@ main() {
     systemctl enable avahi-daemon
     success "Avahi 服务已启动并设置开机自启"
 
+    # 更新IP地址（如果配置了静态IP）
+    LOCAL_IP=$(get_ip)
+
     # 完成提示
     echo ""
     echo -e "${GREEN}╔══════════════════════════════════════════════════════════╗${NC}"
     echo -e "${GREEN}║                    安装完成!                             ║${NC}"
     echo -e "${GREEN}╚══════════════════════════════════════════════════════════╝${NC}"
     echo ""
+    if [[ "$config_static_ip" =~ ^[Yy]$ ]]; then
+        echo -e "  ${GREEN}[静态IP]${NC} 已配置，IP 地址固定为: ${LOCAL_IP}"
+        echo ""
+    fi
     echo -e "  ${BLUE}CUPS 管理界面:${NC} https://${LOCAL_IP}:631"
     echo -e "  ${BLUE}用户名:${NC} root"
     echo -e "  ${BLUE}密码:${NC} 你的 SSH 密码"