Abstract: The adaptive sliding mode output feedback tracking control problem for a class of systems with sector nonlinear inputs containing non-symmetric saturated deadzones is studied.Under the assumption that the system mathematical models are known or unknown,the synthetical design schemes for sliding mode controllers are presented based on the adaptive observer and the fuzzy observer respectively,and the parameter adjusting laws of the adaptive controller and the fuzzy logic system are derived by defining a class of Lyapunov function.The proposed method not only has the advantage of less dependence on system models,but also enhances the robustness to disturbances,and ensures the stability of the closed-loop tracking error systems.Finally,simulation results demonstrate the effectivity of the proposed method.