The control system of PLC traffic lights is studied based on image processing technique. It is found that the time span of the traffic lights can be controlled by the detected vehicle running information. The results indicate that extending the traditional four phases to twelve phases at the intersection can make the empty waiting time in traditional traffic lights control system be full used,without changing the existing road conditions,and can improve the efficiency of road.%应用图像处理技术，研究了PLC交通信号灯控制系统，发现交通信号灯亮的时间长度可以通过检测到的车辆运行信息控制，这表明将传统的路口四相位扩展到十二相位，能够充分利用传统信号灯控制系统中的空等待时间，在不改变路况的现有条件下，有效提高路口车辆的通行效率。
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