文章介绍了基于USB接口芯片的数据采集和控制卡的设计，整个系统主要由六个部分组成：USB接口芯片、本地端控制器、A/D、D/A、计数器以及DIO口，通过主机应用软件来控制USB口的读写、数据采集、D/A控制以及数据传输。文中详细介绍了USB接口芯片CH371的工作原理及应用、数据采集器件ADS7825的工作原理及应用和DAC器件LTC1450的应用等，并利用MFC进行主机应用软件的设计。关键字：USB接口芯片；数据采集；CH371；ADS7825；LTC1450Abstract：The paper introduces a design of data acquisition and control card based on USB interface. The entire system is mostly composed of six parts: USB interface chip ，MCU，A/D，D/A，counter and DIO. The host computer can control the read or write of the USB interface，data acquisition， D/A and data transmission, et al. In this paper, the principle and application of USB interface chip CH371， ADS7825 and LTC1450 are presented in detail. The host computer software is designed in MFC.Keywords：USB；data acquisition；CH371；ADS7825；LTC1450