For matching problem of the wheeled vehicles transmission system, the natural characteristics＇ sensitivities with respect to the undamped equivalent model parameters are derived from an established lumped mass model, which includes the stiffness and inertia of the vehicle powertrain. Based on the sensitivity analysis, a multi-step method for dynamic modification was presented. The Simulink simulation result indicates that it may avoid torsional vibration better to modify structural parameters of the model. The simulation method proposed in this paper for matching problem of the wheeled vehicle powertrain provides a new way.