Aiming at the problem of simulation and analysis of rolling performance in the design and development of the chassis structure of a target dummy vehicle， the nonlinear dynamics finite element method is used to simulate the rolling performance of the chassis. Calculated results are compared with the experimental results， and the reasons for the large error are analyzed. Parameters of the wheel model of the experimental vehicle in the chassis rolling model are modified by the parameters reverse method， and the optimal solution of the wheel model parameters is obtained based on genetic algorithm. Based on the modified parameters according to the optimal solution of the wheel model parameters， the fitting degree of the simulation results and the experimental values of the modified wheel parameters are greatly improved. The maximum displacement error of the measurement point is reduced from 16.7% to 2.6%， and the root mean square error of the evaluation point is reduced by 91.9%. The accuracy of the simulation analysis results of the target dummy vehicle chassis rolling has been greatly improved， which provides a reference model for the subsequent structural damage diagnosis and structural optimization simulation research.