Rollover is one of the main traffic accident forms for vehicle. According to the datas recently, rollover has become the second most serious accident. However, the study on rollover in China is at the beginning. The study on vehicle rollover is based on the theories of rollover. In order to optimize vehicle configuration,and enhance vehicle rollover stability,and ensure the road safety, rollover model is proposed and simulated in computer. Besides, the reasons that have effect on rollover are analyzed in detail. The final result can provide a scientific basis for the optimization of the vehicle's structure and improve the stability of vehicle rollover. Furthermore, some active control systems with rollover prevention are analysized and proposed. At last, the effective control system and the project how to achieve it are provided.