本文主要以AT89C51单片机、DS18B20温度传感器、MAX7219显示驱动器为核心设计温度检测与报警系统。系统具有温度检测、温度显示、温度报警、也可以进行多点测量等特点。通过两个DS18B20实现对两路温度的测量，采用8位共阴极数码管显示温度，蜂鸣器来实现当温度超过某一上限或下限时进行报警并通过按键对温度值进行修改，而且操作简便易于实现。-This paper mainly USES AT89C51 microcontroller as the core, DS18B20 temperature sensor, MAX7219 display drives design temperature detection and alarm system.System has a temperature detection, temperature display, alarm, also can undertake multi-point measurement, etc.Through two DS18B20 to two road temperature measurement, using 8-bit common cathode digital tube display temperature, buzzer to implement when the temperature exceeds a certain limit or lower limit alarm and through the keys to changes of temperature, and the operation simple and easy to implement.