The current ride comfort model does not have the ability to accurate simulate the suspension nonlinear. In order to solve this problem, a seven degree of freedom nonlinear model for ride comfort simulation, was developed. This model was based on seven degree of freedom linear model, through accurate modeling of suspension nonlinear hysteresis and damper nonlinear, to accurately describe suspension nonlinear characteristics. Through the simulation of typical operating conditions, to verify the model have the ability to really describe ride comfort deterioration caused by the suspension nonlinear factor, to further improve the simulation accuracy of ride comfort model. Conduct simulation study about the key factors of ride comfort, the research results show that, it is can improve the ride comfort by reducing suspension stiffness and reasonable matching damping.