As a new type of controllable fluid, magnetorheological fluid has very outstanding performance, mainly for fast solid-liquid performance conversion, simple magnetic field layout, low energy consumption and so on. Thus, it has a broad application prospect, such as automotive, military, construction, bridge, medical, precision polishing and intelligent robotics. The mature products include automotive electromagnetic dampers, building seismic dampers, bridge anti-swing dampers, prosthetic limbs, magnetorheological polishing equipment and so on, and the application of magnetorheological fluid is still expanding.