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With the development of science and technology,the traffic light which designed by electric circuit can not contain the increseing pressure of the traffical day by day,so we must find a new method to replace the control unit which is plex and worked ,the technical of programbal logic controller advanced raiply,and use more and more （ Programmable Controller） is one of the most important ponents of the industry automation. PLC provide automation solution across a broad range of many industries. With the development of science and technology, the function of PLC is more and more perfect, and its get smaller, smarter, more interoperable, more thesis was designed by PLC to control the traffical design a traffical lightBased on application of PLC in the traffic system, this paper systematically describes the foundational principium,the request of the design must be beautiful, generous, the economy apply, has many varieties. Should request for the sake of attain, and consider the cost of the economical electronics ponent, to attain the biggest and economic performance,adopt little programbal logic controller to control the change of the traffical light,we have checed the present traffic control unit,shoose a best plan,in orde to alleviate the present traffic pressure. KEY WORDS: Traffic light； PLC； Tutomatic allies control 3 目 錄 基于 PLC 的交通信號燈控制系統(tǒng)設計 .… .....……………………………………… 6 摘 要 … ......…………………… .....................………………………………………………… ..6 目 錄 … .....… .....................……………………………………………………………………… ..8 前 言 … .…… .…………………………………………………………………………………… ..9 第一章 概述 …… .………………………………………………………………………… 10 167。 正常時期程序 ………………………