This paper analyses the development theory of the client driver of USB bus in the embedded operating system WinCE.

重点分析了设计USB总线客户端驱动程序时采用的流接口驱动的机制的实现。

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USB Function device driver is designed by client, it lies the up layer of USB Bus device driver, it sends and receives information from USB device by send URB to USB Bus device driver.

USB功能驱动程序由设备开发者编写，位于USB总线驱动程序的上层，通过向USB总线驱动程序发送USB请求包，来实现对USB设备信息的发送或接收。

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