本文主要介绍了8751单片机在空调机温度控制中的应用，即通过温度传感器（DS18B20）将采集到的温度信号进行处理，经A/D(ADC0804)转换后传入单片机，再通过单片机控制压缩机来实现对空调机的温度控制。相应的软、硬件设计，实现了对空调机的温度控制，并设计了合理的温度范围（20—34摄氏度），实现了两位温度显示，达到了设计要求。-This paper introduces the 8751 microcontroller in the air conditioning temperature control system, namely, by the temperature sensor (DS18B20) will be collected for processing the temperature signal by the A/D (ADC0804) converted incoming MCU, then the compressor through the MCU to realize the temperature control air conditioning. The corresponding software and hardware design, implementation, the temperature of air-conditioning control, and design a reasonable temperature range (20-34 degrees C), to achieve the two temperature display, meet the design requirements.