Abstract: First，the lumped parameter models of hydraulic bushings and hydraulic engine mounts are established，
and the two hydraulic devices are compared in terms of the continuity equation，the momentum equation and the transfer force equation． Next，by analyzing corresponding equivalent mechanical models，both the equivalent masses of the liquid in inertia channels and the magnification of the damping of the two hydraulic devices are compared． Then，the equations of the pressure and flow response of the two hydraulic devices are derived and compared to interpret the difference in the working mechanisms of the two hydraulic devices． Moreover，under a harmonic excitation，the feature parameter and damping ratio of the two hydraulic devices are extracted and compared．It is found that changing the flexibility parameter of the hydraulic bushings can make the model suitable for the dynamic performance analysis of the hydraulic engine mounts． Finally，the proposed models and the analysis methods are proved to be correct by an experiment．

Key words: hydraulic bushing, hydraulic engine mount, lumped parameter model, dynamic analysis, unified model