diff --git a/en/application-dev/device/usb-guidelines.md b/en/application-dev/device/usb-guidelines.md
index 651ac2b64fa7d7e7cd815e09cd0e9d0514179755..5e3e6ba1c139a6bf5717865a040884d8ce6e40a4 100644
--- a/en/application-dev/device/usb-guidelines.md
+++ b/en/application-dev/device/usb-guidelines.md
@@ -21,7 +21,7 @@ The following table lists the USB APIs currently available. For details, see the
 | setConfiguration(pipe: USBDevicePipe, config: USBConfig): number | Sets the USB device configuration.                           |
 | setInterface(pipe: USBDevicePipe, iface: USBInterface): number | Sets a USB interface.                                        |
 | claimInterface(pipe: USBDevicePipe, iface: USBInterface, force?: boolean): number | Claims a USB interface.                                       |
-| function bulkTransfer(pipe: USBDevicePipe, endpoint: USBEndpoint, buffer: Uint8Array, timeout?: number): Promise\<number> | Performs bulk transfer.                                      |
+| bulkTransfer(pipe: USBDevicePipe, endpoint: USBEndpoint, buffer: Uint8Array, timeout?: number): Promise\<number> | Performs bulk transfer.                                      |
 | closePipe(pipe: USBDevicePipe): number                       | Closes a USB device pipe.                                    |
 | releaseInterface(pipe: USBDevicePipe, iface: USBInterface): number | Releases a USB interface.                                    |
 | getFileDescriptor(pipe: USBDevicePipe): number               | Obtains the file descriptor.                                 |
diff --git a/zh-cn/application-dev/device/usb-guidelines.md b/zh-cn/application-dev/device/usb-guidelines.md
index 97dbe7ec09977f5491f10846a64f9708e745e490..a4b96c2735fcca119917c6c1fcd24e892ac4a3a0 100644
--- a/zh-cn/application-dev/device/usb-guidelines.md
+++ b/zh-cn/application-dev/device/usb-guidelines.md
@@ -24,7 +24,7 @@ USB类开放能力如下，具体请查阅[API参考文档](../reference/apis/js
 | setConfiguration(pipe:&nbsp;USBDevicePipe,&nbsp;config:&nbsp;USBConfig):&nbsp;number | 设置设备的配置。 |
 | setInterface(pipe:&nbsp;USBDevicePipe,&nbsp;iface:&nbsp;USBInterface):&nbsp;number | 设置设备的接口。 |
 | claimInterface(pipe:&nbsp;USBDevicePipe,&nbsp;iface:&nbsp;USBInterface,&nbsp;force?:&nbsp;boolean):&nbsp;number | 获取接口。 |
-| function&nbsp;bulkTransfer(pipe:&nbsp;USBDevicePipe,&nbsp;endpoint:&nbsp;USBEndpoint,&nbsp;buffer:&nbsp;Uint8Array,&nbsp;timeout?:&nbsp;number):&nbsp;Promise&lt;number&gt; | 批量传输。 |
+|bulkTransfer(pipe:&nbsp;USBDevicePipe,&nbsp;endpoint:&nbsp;USBEndpoint,&nbsp;buffer:&nbsp;Uint8Array,&nbsp;timeout?:&nbsp;number):&nbsp;Promise&lt;number&gt; | 批量传输。 |
 | closePipe(pipe:&nbsp;USBDevicePipe):&nbsp;number | 关闭设备消息控制通道。 |
 | releaseInterface(pipe:&nbsp;USBDevicePipe,&nbsp;iface:&nbsp;USBInterface):&nbsp;number | 释放接口。 |
 | getFileDescriptor(pipe:&nbsp;USBDevicePipe):&nbsp;number | 获取文件描述符。 |