Take ADC0809 and 8051 as the cores, this system has three parts: Data acquisition, data processing and demonstration, terminal receive. Includes the control, the demonstration, a/D switch, the level switch connection, the personal computer specifically and so on. In the design carries on 8 groups data with ADC0809 the sampling, uses the MCS-51 monolithic integrated circuit's serial port transmission and the receive data. Demonstrated that the part by 8155, 75452, 7407 and the LED numerical code monitor constitutes. The hardware design application electron design automation tool, the software design uses the modular programming method. key words: The data acquisition, EDA, the serial port, the modulation programs