Applicable to the production of magnetorheological damping equipment magnetorheological fluid should have the following characteristics: In magnetic field under the effect of a higher yield stress; has lower viscosity at zero field effect; the operation temperature scale is wide; the settlement stability and cohesion of long-term stability; better chemical stability; echo time is short; and the sealing element is not a chemical effect. The magneto rheological damping equipment fitness into various, its working principle is the following three ways, see figure 1. 1 pressure driving mode (PressuredrivenflowmodeorValvemode) is currently the most commonly used mode of operation. Its principle as shown in Figure 1a, magnetic fluids under pressure effect through the fixed magnetic pole, magnetic fluid activity direction and magnetic field direction straight, but after the damping force excitation coil current changes the control of magneto rheological damper. The system can be used in servo control valves, dampers and shock absorber etc.. 2 shear mode (Directshearmode) as shown in Figure 1b, magnetic fluid by controllable magnetic field in the movable magnetic pole under the effect of magnetic field, magnetic pole moving direction and the direction of mutual straight, this system can be used in the clutch, brake, locking device and a damper of magneto rheological equipment. 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 I 3 extrusion mode (Compressivesqueezefilmmode) as shown in Figure 1C, the magnetic pole moving direction and magnetic field direction are the same, magnetic fluids in magnetic pole under the effect of pressure to the surrounding activities, the direction of the magnetic field and magnetic fluid activity direction straight. Magnetic pole moving smaller displacement, magnetorheological damping force generated by the larger, can be used in the small displacement and large damping magnetorheological damper etc..