本课题介绍了以AT89C51单片机为核心的温度控制系统的工作原理和设计方法。温度信号由温度芯片DS18B20采集，并以数字信号的方式传送给单片机。文中介绍了该控制系统的硬件部分，包括：温度检测电路、温度控制电路、温度显示电路、报警电路和一些接口电路 。单片机通过对信号进行相应处理，从而实现温度控制的目的。文中还以图文并茂的方式着重介绍了各部分的电路组成和软件设计部分，在这里采用模块化结构，主要模块有：主程序、数码管显示子程序、键盘扫描及按键处理子程序、温度设定子程序、以及有关DS1820的程序。-Introduction of the topic to the AT89C51 single-chip microcomputer as the core temperature control system working principle and design method. Temperature signal from temperature chip DS18B20 acquisition and digital signal transmission to the single-chip microcomputer. In this paper, the control system hardware components, including: temperature detection circuit, temperature control circuit, temperature display circuit, alarm circuit, and some interface circuits. Single-chip signals through the corresponding treatment in order to achieve the purpose of temperature control. It also illustrated the way in order to focus on the various parts of the circuit and software design of the modular structure here, the main modules are: the main program, a digital display subroutine, keyboard scanning and treatment Subroutine button, temperature-based set subprogram, and the DS1820 procedures.