Abstract: Magnetorheological fluids have high controllability and continuity, and are widely used in semi-active shock absorbers, polishing devices and torque transfer devices. The sedimentation stability is an important indicator to ensure their performance. The detection method of the sedimentation stability of magnetorheological fluids is summarized, and the research progress on improving the sedimentation stability of magnetorheological fluids is described from three aspects of magnetic particles, additives and carrier fluid. Considering the problems in the sedimentation stability research of magnetorheological fluids, some points of view are put forward for the future research direction.