Abstract: In order to improve the low frequency characteristic of engine mount, a MRF (Magneto-rheological Fluid) engine mount was designed in the paper based on the rheological property of MRF. The expression of liquid resistance in the flow mode was derived. Bond graph model of MRF engine mount was built to deduce the expression of the dynamic stiffness and loss angle. Then the dynamic characteristics at low frequency were simulated in MATLAB. The comparison of the simulation and experimental results proved that the model was accurate. Considering equivalent stiffness and damping, the two-degrees-of freedom model of engine-frame system was built and simulation model was built in MATLAB/Simulink. Then the isolation performance of the MRF engine mount was simulated by Fuzzy-PID control method under different working conditions. The simulation results proved that MRF engine mount combined with fuzzy PID control method was effective to reduce the body acceleration and the force transferred to the frame. This research provides a reference for further research and development of MRF mount.