Abstract:Vehicle Ad Hoc Network (VANET) is a kind of Wireless Ad hoc network, which takes the vehicle as the communication node. It aims to achieve data transmission between vehicle and vehicle, or between vehicle and infrastructure. The high-speed mobility of vehicles can easily cause the change of network topology, as a result, the transmission rate of data packets and the efficiency of routing protocol are reduced, and even lead to channel interruption. The research on the communication protocol and application of the VANET is mainly implemented by the simulation platform, It’s crucial that the performance of vehicle mobility model embedded in the platform for protocol analysis and research. Firstly, various Car-following models under the simulation of urban mobility(SUMO) platform are described in detail. Then, this paper introduces three factors that have the most obvious impact on the performance of mobile models. Finally, based on the urban road traffic environment, this paper compares and analyzes the three indicators of vehicle density, average vehicle speed and road occupancy rate under different car-following models by setting different simulation scenarios. The experimental results show that Krauss model has better performance. In addition, simulating the car-following behavior of a single vehicle reveals the working mechanism of each model microscopically.