In view of the instability and poor time effectiveness of data in the city intersection vehicles queuing system, this paper puts forward a method to simulate intersections vehicles queuing system by using Flexsim. Firstly, the rules and service time of vehicles queuing System are obtained based on the field data. Then, the vehicles arrival interval functions of the queuing system are fitted by the software of ExpertFit and a simulation through using the functions was carried out. Finally, the optimized solution is proposed according to the result of the simulation. In conclusion, this study proves that the Flexsim simulation can solve problems of intersection traffic jams effectively, which presents a applicable prospect of the system.