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In order to reduce the vibration energy transferred from engine to the chassis of a vehicle and improve the riding comfortability of the vehicle, a new semi-active controlled hydraulic mount is developed which could adjust the vibration isolating effect at wide frequency range. The dynamic characteristic of the new mount could be changed through adjusting the cross-sectional area of its inertia channel. The control strategy of the mount is based on a great deal of engine tests. Test results of the semi-active mount on an engine test bench show that it could optimize the isolation effect according to engine''s working condition.