本文提出了一种寻轨小车控制系统的设计方案，本方案采用AT89S51单片机作为寻轨小车的检测和控制核心，能够实现小车寻轨、避障、液晶显示时间等功能。-This paper presents a control system to find rail car design, the program uses AT89S51 microcontroller as rail car testing and seeking control of the core, to achieve car track seeking, obstacle avoidance, LCD display time and other functions.