A study on the influences of chassis geometric characteristics on wheel alignment and vehicle dynamic performances has been carried out by simulation of two different vehicle models. The vehicles are composed of the same type suspension and tire. They are distinguished by suspension geometric characteristics, which has led to different wheel alignment static variances and dynamic behavior. These vehicle models, with 130 degrees of freedom, are elaborately tuned to simulate real vehicles. As the results of this study, some of the most important chassis geometric characteristics and wheel alignment, which govern vehicle dynamic performances, have been verified.