Abstract: The behavior of damping devices based on magnetorheogical fluid(MR fluid) is determined by a variety of factors.In this paper,issues and their solutions in design of MR fluid damping devices,which are characteristics of MR fluid,working mode,magnetic circuit,magnetic flux guide,electric coil,structure parameters,compen sation method etc.,were presented and discussed in detail.The futures of magnetorheological techniques in engineering application were prospected and the directions of further developing in the field were pointed out.