Abstract: In consideration of problems of current magnetic rheology damping devices concerning overheating, structural complexity, low magnetic field utilization ratio and precipitations, based on the requirement for the vehicle's shock absorption, which should be proportionally controlled with the damping device, this paper presents a design of a new-type magnetic rheology damping device for vehicles that adopts an external magnetic field of bypass type and a one-way liquid flow, for which the advanced development and test phases have already successfully completed. The new magnetic rheology damping device has prominent features in its working principle and structures, including the efficient use of magnetic field, the matching of pull and push forces, and the handling of precipitation and forces of multi-degrees of freedom. The damping part is connected to the structure in a serial manner, and the coil is inside the cylinder near the tube wall, to reduce the size in the radial direction, to secure a good radiation condition and for convenient maintenance. The effects of the exciting current, the oscillation amplitude and the frequency on the damping force are experimetally analyzed, and the new magnetic rheology damping device is shown to be able to generate the pull and push damping force to effectively match the proportional control structural design, which satisfies the requirement in attenuating the vehicle's vibration. The parallel disc slit type damping can enhance the efficiency of the magnetic field in generating the magnetic rheology damping force, to extend the damping force's range and to ease its control. The new device provides a new technical way for the performance improvement, an effective feasible new antihunt device and an important vehicle's antivibration application.