Abstract:The rapid development of science and technology to make intelligent transportation as an effective means to solve traffic problems, for the traffic flow phenomenon of morning and afternoon peak hour traffic and the direction of imbalance at intersection, this paper induces the thought of traffic guidance , makes use of variable approach to solve traffic congestion during peak periods at the signalized intersection ,gives the way of the data acquisition and the conditions of lanes change,Variable Message Sign (VMS) is used to display the information of lanes change in a timely manner,with the actual the intersection model is established,the same time,with rich API of the microscopic traffic simulation software-paramics to achieve the model simulation,the comparison and evaluation results are presented.The results shows that the using of variable approach can significantly improve the intersection level of service .