超声波测距在社会生活中已经有广泛的应用如汽车倒车雷达等。本文主要研究了一种基于单片机微处理器的超声波测距仪。该仪器以空气中超声波的传播速度为确定条件，利用反射超声波测量待测距离。本文阐述了仪器研制的理论基础，介绍了具体的软硬件设计以及相关情况。-Ultrasonic Ranging in social life have been widely used as vehicles for reversing radar. This paper studies a microprocessor-based SCM ultrasonic range finder. The equipment to the air ultrasonic propagation velocity to determine conditions, the use of reflective ultrasonic distance measurement analyte. This paper describes the equipment developed by the theoretical basis on the specific hardware and software design and the relevant circumstances.