diff --git a/components/drivers/Kconfig b/components/drivers/Kconfig
index c567233c847b67257056816456bc29fecc0658f0..3995199ac23892e07e22b5a45c6e1fd56d2a75e7 100755
--- a/components/drivers/Kconfig
+++ b/components/drivers/Kconfig
@@ -712,6 +712,9 @@ menu "Using USB"
                     config RT_VCOM_TASK_STK_SIZE
                         int "virtual com thread stack size"
                         default 512
+                    config RT_CDC_RX_BUFSIZE
+                        int "virtual com rx buffer size"
+                        default 128
                     config RT_VCOM_TX_USE_DMA
                         bool "Enable to use dma for vcom tx"
                         default n
diff --git a/components/drivers/usb/usbdevice/class/cdc_vcom.c b/components/drivers/usb/usbdevice/class/cdc_vcom.c
index b6044b37a7c5298b3e5477c25c1f26a16cc69730..c94a438131c63614561100b74bff7e0991bf8871 100644
--- a/components/drivers/usb/usbdevice/class/cdc_vcom.c
+++ b/components/drivers/usb/usbdevice/class/cdc_vcom.c
@@ -28,7 +28,11 @@
 #define VCOM_TX_TIMEOUT      1000
 #endif /*RT_VCOM_TX_TIMEOUT*/
 
+#ifdef RT_CDC_RX_BUFSIZE
+#define CDC_RX_BUFSIZE          RT_CDC_RX_BUFSIZE
+#else
 #define CDC_RX_BUFSIZE          128
+#endif
 #define CDC_MAX_PACKET_SIZE     64
 #define VCOM_DEVICE             "vcom"