diff --git a/src/main.rs b/src/main.rs
index 4652a9b..bafe3a6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -134,6 +134,20 @@ async fn run_mqtt_and_serial() -> Result<()> {
     // 读取配置
     let config = read_config()?;
     
+    // 检查串口是否被占用
+    println!("正在检查串口 {} 是否可用...", config.serial_port);
+    match serialport::new(&config.serial_port, config.baud_rate)
+        .timeout(Duration::from_millis(10))
+        .open() {
+        Err(e) => {
+            if e.kind() == std::io::ErrorKind::PermissionDenied {
+                eprintln!("串口 {} 已被占用", config.serial_port);
+                return Ok(());
+            }
+        },
+        Ok(_) => {}
+    }
+    
     // 创建 MQTT 客户端
     let mut mqttopts = MqttOptions::new(
         &config.mqtt.client_id,