At present, the magnetorheological skills has made a lot of research results, during which a lot of magneto rheological damper has begun to enter the engineering application, is mainly used in automobiles, machinery and construction structure field. Dongguan Jincheng Industrial Co., Ltd. is a research and development, manufacturing, sale of tension control, magnetic damper, as one of the professional manufacturers, the main production: tension device series, magnetic damper series, tension device, magnetic damper, magnetic damper damper, damper, and other goods. Www.www.swlawyer.org.cn American now have practical products available, during which Delph used in automobile suspension system of magneto rheological damper development, realizes the suspension damping adjustable, safety and improve the Shun automobile. The project was named the 1999 annual world 100 major scientific and technological achievements of [8], the system has been in 2000 loading test.