diff --git a/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v1/uart.md b/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v1/uart.md
index d06fd958044a420d19f9b445d3324a03d44f594e..4977452cd661121a51d5f72a0ca4cbc1e0a03ff4 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v1/uart.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v1/uart.md
@@ -587,7 +587,7 @@ 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 == RT_EOK)
+        if (result > 0)
         {
             /* 从串口读取数据*/
             rx_length = rt_device_read(msg.dev, 0, rx_buffer, msg.size);
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 ee0684a3d9976457635d588a8d4b21122ea6a7a2..418fa79a60f56204df37a7632707732dd110edbb 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 == RT_EOK)
+        if (result > 0)
         {
             /* 从串口读取数据 */
             rx_length = rt_device_read(msg.dev, 0, rx_buffer, msg.size);
diff --git a/rt-thread-version/rt-thread-standard/programming-manual/ipc2/ipc2.md b/rt-thread-version/rt-thread-standard/programming-manual/ipc2/ipc2.md
index 4b685e5b606f449cebdbbcfd13b23365322eb935..48d223430878b41fa14d31c74d7cba1e9732f5ff 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/ipc2/ipc2.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/ipc2/ipc2.md
@@ -572,7 +572,7 @@ rt_err_t rt_mq_urgent(rt_mq_t mq, void* buffer, rt_size_t size);
 当消息队列中有消息时，接收者才能接收消息，否则接收者会根据超时时间设置，或挂起在消息队列的等待线程队列上，或直接返回。接收消息函数接口如下：
 
 ```c
-rt_err_t rt_mq_recv (rt_mq_t mq, void* buffer,
+rt_ssize_t rt_mq_recv (rt_mq_t mq, void* buffer,
                     rt_size_t size, rt_int32_t timeout);
 ```
 
@@ -585,7 +585,7 @@ rt_err_t rt_mq_recv (rt_mq_t mq, void* buffer,
 | size          | 消息大小           |
 | timeout       | 指定的超时时间     |
 |**返回**     | ——                 |
-| RT_EOK        | 成功收到           |
+| 接收到消息的长度 | 成功收到           |
 | \-RT_ETIMEOUT | 超时               |
 | \-RT_ERROR    | 失败，返回错误     |
 
@@ -617,7 +617,7 @@ static void thread1_entry(void *parameter)
     while (1)
     {
         /* 从消息队列中接收消息 */
-        if (rt_mq_recv(&mq, &buf, sizeof(buf), RT_WAITING_FOREVER) == RT_EOK)
+        if (rt_mq_recv(&mq, &buf, sizeof(buf), RT_WAITING_FOREVER) > 0)
         {
             rt_kprintf("thread1: recv msg from msg queue, the content:%c\n", buf);
             if (cnt == 19)
@@ -806,7 +806,7 @@ void message_handler()
     struct msg msg_ptr; /* 用于放置消息的局部变量 */
 
     /* 从消息队列中接收消息到 msg_ptr 中 */
-    if (rt_mq_recv(mq, (void*)&msg_ptr, sizeof(struct msg), RT_WAITING_FOREVER) == RT_EOK)
+    if (rt_mq_recv(mq, (void*)&msg_ptr, sizeof(struct msg), RT_WAITING_FOREVER) > 0)
     {
         /* 成功接收到消息，进行相应的数据处理 */
     }
diff --git a/rt-thread-version/rt-thread-standard/tutorial/experimental-manual/msgq_sample/msgq_sample.md b/rt-thread-version/rt-thread-standard/tutorial/experimental-manual/msgq_sample/msgq_sample.md
index 07b4e8a3ed18540ccccefec35916acdbdaab312d..823503e37806574240f1694a2adf5ff1b87a0c88 100644
--- a/rt-thread-version/rt-thread-standard/tutorial/experimental-manual/msgq_sample/msgq_sample.md
+++ b/rt-thread-version/rt-thread-standard/tutorial/experimental-manual/msgq_sample/msgq_sample.md
@@ -84,7 +84,7 @@ static void thread1_entry(void *parameter)
     while (1)
     {
         /* 从消息队列中接收消息 */
-        if (rt_mq_recv(&mq, &buf, sizeof(buf), RT_WAITING_FOREVER) == RT_EOK)
+        if (rt_mq_recv(&mq, &buf, sizeof(buf), RT_WAITING_FOREVER) > 0)
         {
             rt_kprintf("thread1: recv msg from msg queue, the content:%c\n", buf);
             if (cnt == 19)