diff --git a/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/uart.md b/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/uart.md
index 418fa79a60f56204df37a7632707732dd110edbb..ee0684a3d9976457635d588a8d4b21122ea6a7a2 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/uart.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/uart.md
@@ -628,7 +628,7 @@ static void serial_thread_entry(void *parameter)
         rt_memset(&msg, 0, sizeof(msg));
         /* 从消息队列中读取消息 */
         result = rt_mq_recv(&rx_mq, &msg, sizeof(msg), RT_WAITING_FOREVER);
-        if (result > 0)
+        if (result == RT_EOK)
         {
             /* 从串口读取数据 */
             rx_length = rt_device_read(msg.dev, 0, rx_buffer, msg.size);