Abstract: For the actuator fault of wind energy conversion system (WECS), the state equation of WECS is designed and analyzed. Continual gain actuator faults of system are converted into the parameter uncertainties of driving system, and then the T-S fuzzy model of the system is deduced. Adopting state feedback of parallel distributed compensation structure, considering system actuator fault, a robust fault-tolerant controller is designed, and the system stability can be proved. The simulation results indicate WECS with actuator fault can also achieve maximum wind energy capture below the rated wind speed, the degree of fault deterioration is slowed down, and the utilization rate of the wind turbine is also improved.