diff --git a/components/drivers/usb/usbdevice/class/cdc_vcom.c b/components/drivers/usb/usbdevice/class/cdc_vcom.c
index c7097f135c893742acff62545406fb839a767d58..e74738bbe0b991b42a681d572aa958603175ef52 100644
--- a/components/drivers/usb/usbdevice/class/cdc_vcom.c
+++ b/components/drivers/usb/usbdevice/class/cdc_vcom.c
@@ -332,14 +332,33 @@ static rt_err_t _ep_out_handler(ufunction_t func, rt_size_t size)
     if((data->serial.parent.flag & RT_DEVICE_FLAG_ACTIVATED)
         && (data->serial.parent.open_flag & RT_DEVICE_OFLAG_OPEN))
     {
-        /* receive data from USB VCOM */
+        #ifdef RT_USING_SERIAL_V1
+        /* notify receive data */
+        rt_hw_serial_isr(&data->serial,RT_SERIAL_EVENT_RX_IND);
+        #endif
+        #ifdef RT_USING_SERIAL_V2
+        int ch = -1;
+        int put_index = 0;
+        while (1)
+        {
+            ch = data->serial.ops->getc(&data->serial);
+            if (ch == -1) break;
+            /* disable interrupt */
+            level = rt_hw_interrupt_disable();
+            data->ep_out->buffer[put_index++] = ch;
+            /* enable interrupt */
+            rt_hw_interrupt_enable(level);
+            if (put_index >= data->serial.config.rx_bufsz) break;
+        }
+        #endif
         level = rt_hw_interrupt_disable();
-
+        /* receive data from USB VCOM */
         rt_ringbuffer_put(&data->rx_ringbuffer, data->ep_out->buffer, size);
         rt_hw_interrupt_enable(level);
-
+        #ifdef RT_USING_SERIAL_V2
         /* notify receive data */
         rt_hw_serial_isr(&data->serial,RT_SERIAL_EVENT_RX_IND);
+        #endif
     }
 
     data->ep_out->request.buffer = data->ep_out->buffer;
@@ -498,8 +517,11 @@ static rt_err_t _function_enable(ufunction_t func)
     data->ep_out->buffer = rt_malloc(CDC_RX_BUFSIZE);
     RT_ASSERT(data->ep_out->buffer != RT_NULL);
 
-#ifdef RT_USING_SERIAL_V2
+#if defined(RT_USING_SERIAL_V1)
+    data->serial.serial_rx = data->ep_out->buffer;
+#elif defined(RT_USING_SERIAL_V2)
     data->serial.serial_rx = &data->rx_ringbuffer;
+    //data->serial.serial_tx = &data->tx_ringbuffer;
 #endif
 
     data->ep_out->request.buffer = data->ep_out->buffer;