A mode of multi-dimensional damping platform was established, in which parallel mechanism was used as main mechanism and MR damper was used as performer. A semi-active controller was designed by using fuzzy algorithm, and it was applied to control three branches of the mechanism. The system was simulated by ADAMS and Matlab software. The simulated vibration effect under on fuzzy controller was compared with that under off controller. It was found that the acceleration peak value and mean square root value of the moving platform all dropped about 40%. The results showed that the damping system and control algorithm were effective to multi-dimensional damping. 