By using sequential function chart as a train of thought and binding it with experience-based design method, the design of a complex traffic light controlling system has been completed. Meanwhile, the cumbersome process of using experience-based design method has been avoided and the program design becomes much vivid and more understandable as well as easier to be extended.%将顺序功能图(SFC)做为一种思路，结合通用的经验设计法解决了一个复杂的交通灯控制系统的设计任务，避免了完全使用经验设计法的繁琐并使得程序设计变得更加形象、易于理解且便于修改与扩展。
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