本文提出了一种基于AT89S51和模数转换芯片ADC0809的数据采集系统的设计与实现方案。主要从硬件电路设计、数据采集程序设计2个方面进行了详细阐述,其中硬件电路设计部分结合具体芯片，详细的介绍了数据采集系统各部分硬件接口电路的设计。设计中利用51单片机控制A/D转换器构成采样模块，实现对信号的采集，采样后的数据通过LED显示出来。本论文设计并实现了一种数据采集系统，具有简单可靠、使用方便、扩展性强等特点。-This paper presents a AT89S51-based and analog-digital conversion chip ADC0809 Data Acquisition System Design and Implementation of the program. Mainly from the hardware circuit design, data collection procedures for the design of two aspects in detail, including some combination of hardware circuit design specific chips, introduced in detail the various parts of data acquisition system hardware interface circuit design. Designed to control the use of 51 single-chip A/D converter sampling constitutes a module, to achieve signal acquisition, sampling data displayed through the LED. This paper is designed and implemented a data acquisition system with a simple, reliable and easy to use, scalability and strong characteristics.