本文设计了一个基于AT89S52单片机控制的水温控制系统, 由下位机、上位机、和通讯网络三部分组成。下位机是基于单片机AT89S52和温度传感器DS18B20的高精度数据采集系统，功能是对温度的检测与输出控制。上位机采用计算机，与下位机进行数据信息的交互，并显示各路温度值及其曲线、控制参数、设定值等。-This paper designed a water temperature based on AT89S52 MCU control system, the lower computer, host computer, and communications network composed of three parts. Lower machine is based on the MCU AT89S52 and temperature sensor DS18B20 of precision data acquisition system, the detection function of the temperature and output. Host computer by computer, and the next data bit machine interaction, and display temperature from various quarters and the curve, control parameters, setting, etc..