diff --git a/demo/adb/usbd_adb_template.c b/demo/adb/usbd_adb_template.c
index 635a7bd3..a97de8ff 100644
--- a/demo/adb/usbd_adb_template.c
+++ b/demo/adb/usbd_adb_template.c
@@ -288,7 +288,7 @@ void cherryadb_init(uint8_t busid, uint32_t reg_base)
     /* shell_init() must be called in-task */
     if (0 != shell_init(false)) {
         /* shell failed to be initialized */
-        printf("Failed to initialize shell\r\n");
+        USB_LOG_RAW("Failed to initialize shell\r\n");
         for (;;) {
             ;
         }
diff --git a/demo/audio_v1_mic_speaker_multichan_template.c b/demo/audio_v1_mic_speaker_multichan_template.c
index c764ee93..5ff5684c 100644
--- a/demo/audio_v1_mic_speaker_multichan_template.c
+++ b/demo/audio_v1_mic_speaker_multichan_template.c
@@ -297,11 +297,11 @@ void usbd_audio_open(uint8_t busid, uint8_t intf)
         AUDIO_FEEDBACK_TO_BUF_FS(s_speaker_feedback_buffer, feedback_value); /* uac1 can only use 10.14 */
         usbd_ep_start_write(busid, AUDIO_OUT_FEEDBACK_EP, s_speaker_feedback_buffer, FEEDBACK_ENDP_PACKET_SIZE);
 #endif
-        printf("OPEN1\r\n");
+        USB_LOG_INFO("OPEN1\r\n");
     } else {
         tx_flag = 1;
         ep_tx_busy_flag = false;
-        printf("OPEN2\r\n");
+        USB_LOG_INFO("OPEN2\r\n");
     }
 }
 
@@ -309,11 +309,11 @@ void usbd_audio_close(uint8_t busid, uint8_t intf)
 {
     if (intf == 1) {
         rx_flag = 0;
-        printf("CLOSE1\r\n");
+        USB_LOG_INFO("CLOSE1\r\n");
     } else {
         tx_flag = 0;
         ep_tx_busy_flag = false;
-        printf("CLOSE2\r\n");
+        USB_LOG_INFO("CLOSE2\r\n");
     }
 }
 
diff --git a/demo/usb_host.c b/demo/usb_host.c
index 0863970e..89e78018 100644
--- a/demo/usb_host.c
+++ b/demo/usb_host.c
@@ -236,7 +236,7 @@ int usb_msc_fatfs_test()
         while (write_size > 0) {
             res_sd = f_write(&fnew, read_write_buffer, BUF_SIZE, (UINT*)&fnum);
             if (res_sd != FR_OK) {
-                printf("Write file failed, cause: %s\n", res_sd);
+                USB_LOG_RAW("Write file failed, cause: %s\n", res_sd);
                 goto unmount;
             }
             write_size -= BUF_SIZE;
@@ -262,7 +262,7 @@ int usb_msc_fatfs_test()
         while (write_size > 0) {
             res_sd = f_read(&fnew, read_write_buffer, BUF_SIZE, (UINT*)&fnum);
             if (res_sd != FR_OK) {
-                printf("Read file failed, cause: %s\n", res_sd);
+                USB_LOG_RAW("Read file failed, cause: %s\n", res_sd);
                 goto unmount;
             }
             write_size -= BUF_SIZE;
diff --git a/demo/video_audiov1_hid_template.c b/demo/video_audiov1_hid_template.c
index 99df89b9..12db4a6f 100644
--- a/demo/video_audiov1_hid_template.c
+++ b/demo/video_audiov1_hid_template.c
@@ -469,11 +469,11 @@ void usbd_audio_open(uint8_t busid, uint8_t intf)
         audio_rx_flag = 1;
         /* setup first out ep read transfer */
         usbd_ep_start_read(busid, AUDIO_OUT_EP, audio_read_buffer, AUDIO_OUT_PACKET);
-        printf("OPEN1\r\n");
+        USB_LOG_RAW("OPEN1\r\n");
     } else if (intf == 4) {
         audio_tx_flag = 1;
         audio_iso_tx_busy = false;
-        printf("OPEN2\r\n");
+        USB_LOG_RAW("OPEN2\r\n");
     }
 }
 
@@ -481,11 +481,11 @@ void usbd_audio_close(uint8_t busid, uint8_t intf)
 {
     if (intf == 3) {
         audio_rx_flag = 0;
-        printf("CLOSE1\r\n");
+        USB_LOG_RAW("CLOSE1\r\n");
     } else if (intf == 4) {
         audio_tx_flag = 0;
         audio_iso_tx_busy = false;
-        printf("CLOSE2\r\n");
+        USB_LOG_RAW("CLOSE2\r\n");
     }
 }
 
diff --git a/platform/threadx/usbh_msc_filex.c b/platform/threadx/usbh_msc_filex.c
index 6c815bac..a9c27547 100644
--- a/platform/threadx/usbh_msc_filex.c
+++ b/platform/threadx/usbh_msc_filex.c
@@ -202,7 +202,6 @@ VOID _fx_usbh_msc_driver(FX_MEDIA *media_ptr)
             media_ptr->fx_media_driver_status = FX_IO_ERROR;
             return;
         }
-        printf("read success\r\n");
         /* Successful driver request.  */
         media_ptr->fx_media_driver_status = FX_SUCCESS;
         break;