Abstract: A model of the vibration control of power train for automotive power train mounting system is developed. The transformation of inertial coordinate system of power train mounting system to TRA coordinate system is conducted. The torque excitation of an automotive power train is taken as an example, and optimized in two ways in TRA coordinate system. The calculated results demonstrate that decoupling rate optimization can improve the decoupling radio while the optimization of vibration peak value can decrease the amplitude of torsional vibration in the direction of torque roll axis.