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The main objective of designing the powertrain mount system is to decrease the vibration transmission from the powertrain to the body. The powertrain mount system has enormous effect on the ride comfort of the automobile. The reasonable design of powertrain mount system could not only decrease greatly vibration and noise produced by engine, but also could lengthen the life of the parts. Therefore, it is very important that design of powertrain mount system. The purpose of this paper is to develop an analytical optimum software to assist the design engineer in arriving at a mounting configuration with the most potential to achieve all the desired performance goods without violating size of the engine compartment. 6 DOF (Degree of Freedom) nonlinear mechanical model of powertrain hydraulic mount system is set up. The hydraulic mount''s position, orientation, stiffness and damping are considered as the optimum variables.