The basic structure of the steel plate shearing equipment and the electric control system program realized by single chip computer are introduced, specially the signal processing circuit of photoelectric coder in sheared steel plate length measurement is analysed and the methods of improving measurement accuracy are introduced; 介绍了钢板剪切设备的基本构成和利用单片机实现的电气控制系统方案,重点分析了光电编码器在剪切钢板长度测量中的信号处理电路及提高测量精度的方法;