In order to improve vehicle driving function, the author establishes a three-dimensional model of a sedan McPherson front suspension with ADAMS / CAR, besides, there is an analysis on the wheel vertical beating positioning parameter variation of the suspension when driving. With the evaluation of the rationality of the suspension design parameters, reaching the common method for the analysis and optimization of the vehicle suspension based on ADAMS, by which, we can improve the function of the vehicle suspension system, and save time to design the vehicle suspension.