In order to optimize the bushing and structure of vehicle body,a vibration isolation analysis model for the bushing and the top mount of vehicle suspension system is established,and the expressions of force and displacement vector at each join point between two substructures are decuced.Then,by using the vibration power transmission analysis method,a method is presented to calculate the power transmitting to the vehicle body under the road excitation through each bushings.Moreover,by taking a typical Macpherson suspension as the example,a multi-body dynamic model of the suspension is established with ADAMS software,and the power transmitting to the vehicle body through each bushing and top mount is calculated and analyzed,which helps to identify the maximum power transmission path.Finally,the influence of bushing characteristics on the power transmission is analyzed,and the effect of a hydraulic bushing on the vibration damping of vehicle body caused by the lateral excitation is discussed.