Aiming at the model construction problem of a certain low-speed electric vehicle，a dynamic model of the car was built by using the Motion module of Virtual. Lab software. This model considers the deformation of the body and the main load-bearing parts with weak rigidity, and conducts rigid-flexible coupling analysis to ensure that the whole vehicle dynamic model was consistent with the actual vehicle. In order to ensure the accurate evaluation of performance, the evaluation conditions of Primary Ride & Secondary Ride were established by taking into account the actual pavement excitation. The evaluation indexes and 10 evaluation points of each condition were determined based on ISO 2631-1 and other standards. In order to define the optimization direction of ride comfort, the parametric analysis method of the whole vehicle was established, the sensitivity analysis of chassis parameters was conducted, the influence characteristics of each parameter were determined, and the optimization object was determined, providing a clear analysis idea for the research on the performance of the whole vehicle ride comfort.