Abstract: To achieve a full understanding of the compartment vibration generation mechanisms,an innovative optimum design and criterion of engine mounting was studied based on the theoretical background of transfer path analysis(TPA) and past progress of optimum design of engine mounting systems.Then the vehicle model of transfer function using the data of easy measurement in operational condition of vehicle is put in practice,and transfer path analysis and optimum of transfer functions of engine mounting system also is carried out.The vibration of a car is simulated and optimized.The process of measurement is easy,and time is short.Finally,the effectiveness of the proposed method is validated through optimum of engine mounting system of the car.