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Software defined network(SDN) has attracted much attention in recent years.Some scholars have integrated it with smart city construction.In view of the current situation of decentralized traffic management and combined with the characteristics of SDN forwarding and control separation and centralized control,this paper introduced it into intelligent transport system(ITS),and proposed a collaborative management architecture to achieve collaborative management and improve traffic.Firstly,it expounded the characteristics of SDN,and proposed an intelligent traffic architecture based on SDN by using ITS characteristics and combining with ITS.Secondly,it built a collaborative management strategy model combining factors such as dynamic speed limit,path guidance and weather and compared with a single control strategy.Finally,through simulation experiments,it verified and analyzed the proposed architecture strategy.The experimental results show that compared with the single control strategy,the management under this architecture smooths the traffic flow,reduces the average delay at the intersection by 20.7%,reduces the average queue length by 35%. [ABSTRACT FROM AUTHOR]