This article has analyzed the vehicles absorption of shock the request which should satisfy with the MR damper design,in view of existing MR the damper existence question and the vehicles operating mode demand,through the structural design and the optimization,proposed one kind of uniflow type MR damper design proposal,and has carried on showing to the principle.Has established the shock miti gation system model and MR the damper model,and has carried on the simulation,finally indicated new MR damper satisfies the vehicles antivibration to use MR damper the design request.