本文利用超声波传输中距离和时间的关系，采用AT89S52单片机进行控制及数据处理，设计出了能精确测量两点间距离的超声波测距仪。-In this paper, ultrasonic transmission distance and of time, using AT89S52 micro controller and data processing, designed to accurately measure the distance between two ultrasonic range finder.