Traffic congestion has become a major concern for many cities throughout the world. Simulations provide useful tools for engineer to plan traffic systems and government to make decisions. The microscopic traffic simulation approach defines the behavior of each interactive object in the traffic network, such as a vehicle and a traffic light through an individual model so that we can observe the detail traffic information of a scenario. Since microscopic model requires large computational power and data storage power, new simulation system architecture is needed. In the paper, the background of this research work is introduced. The simulation platform which combines grid, agent and HLA is given. Some considerations about microscopic traffic simulation models and technical issues of this platform are also discussed.