diff --git a/bin/update_port.sh b/bin/update_port.sh
index 51950d2..f17d6d8 100644
--- a/bin/update_port.sh
+++ b/bin/update_port.sh
@@ -1,30 +1,57 @@
 #!/bin/bash
 
-script_dir=$(cd "$(dirname "$0")"; pwd) # 脚本文件绝对路径
-config_dir="$script_dir/../conf"
-source $script_dir/utils/jq_util.sh
+# 查找空闲端口
+find_free_port() {
+  local start="${1:-10001}"
+  local max="${2:-65535}"
 
-old_port=$(jq -r '.inbounds[0].port' "$config_dir/config.json")
-read -p "请输入新的端口[当前端口: $old_port]: " port
+  # 收集当前监听端口（TCP + UDP）
+  local used_ports raw
+  if command -v ss >/dev/null 2>&1; then
+    raw=$(ss -lntu 2>/dev/null || true)
+    used_ports=$(printf "%s\n" "$raw" | awk '{print $5}' | sed -n '2,$p' | sed -E 's/.*[:]//g' | sed '/^$/d')
+  elif command -v netstat >/dev/null 2>&1; then
+    raw=$(netstat -lntu 2>/dev/null || true)
+    used_ports=$(printf "%s\n" "$raw" | awk '{print $4}' | sed -n '2,$p' | sed -E 's/.*[:]//g' | sed '/^$/d')
+  elif command -v lsof >/dev/null 2>&1; then
+    raw=$(lsof -i -P -n 2>/dev/null || true)
+    used_ports=$(printf "%s\n" "$raw" | awk '/LISTEN/ {print $9}' | sed -E 's/.*[:]//g' | sed '/^$/d')
+  else
+    echo "Error: neither ss, netstat nor lsof is available to check listening ports." >&2
+    return 2
+  fi
 
-# 如果输入为空，退出脚本
-if [[ -z "$port" ]]; then
-    echo "输入端口为空, 退出脚本"
-    exit 0
-fi
+  # 用关联数组记录已占用端口（需要 bash 4+）
+  declare -A used_map
+  local p
+  for p in $used_ports; do
+    # 过滤掉非数字
+    if [[ $p =~ ^[0-9]+$ ]]; then
+      used_map["$p"]=1
+    fi
+  done
 
-# 修改端口
-modify_json_file "$config_dir/config.json" ".inbounds[0].port" "$port"
+  # 从 start 到 max 逐个检查
+  for ((port = start; port <= max; port++)); do
+    if [[ -z "${used_map[$port]}" ]]; then
+      echo "$port"
+      return 0
+    fi
+  done
 
-echo "端口修改成功！新端口为: $port"
+  # 没找到可用端口
+  echo "Error: No available port found in range $start-$max" >&2
+  return 1
+}
 
+change_port(){
+  local script_dir=$(cd "$(dirname "$0")"; pwd)
+  local config_dir="$script_dir/../conf"
+  source "$script_dir/utils/jq_util.sh"
+  
+  local port=$(find_free_port)
+  modify_json_file "$config_dir/config.json" ".listen" ":$port"
+  echo "设置端口成功"
+}
 
-read -p "是否要重启容器? (y/N): " restart_choice
-if [[ "$restart_choice" =~ ^[Yy]$ ]]; then
-   echo "正在重启容器..."
-   docker-compose -f $script_dir/../docker-compose.yml down
-   docker-compose -f $script_dir/../docker-compose.yml up -d
-else
-   echo "已跳过重启，请手动重启容器使配置生效"
-fi
-
+change_port
\ No newline at end of file