Abstract: Aiming at the limitations of PI control and fuzzy sliding mode control applied in the AC speed regulating system, this paper proposes a two-state control method for the AC speed regulating system. Both the designing process of fuzzy sliding mode controller and the simulation results of the twostate control method based on PI control and fuzzy sliding mode control are given. It is shown from simulation results that the proposed method may handle the chattering of sliding mode and improve the dynamic performance of the controlled system.