Abstract: Combining both kinds of fuzzy logic forms including fuzzy T-S model and adaptive fuzzy logic systems,this paper presents an observer based control scheme for a class of nonlinear systems.Firstly,the fuzzy T-S model is used to approximate the nonlinear system,and an observer is designed to observe the system status.The fuzzy control law of the fuzzy model is derived with the linear matrix inequality.Secondly,the modeling errors are eliminated by a compensator based on the adaptive fuzzy logic systems.It is proved that the closed loop system satisfies the anticipated performance.Simulation results demonstrate that the control scheme is feasible.