It is difficult to simulate the wind turbine pitch systems precisely which has the features of time changing, nonlinear and disturbing, because of the randomness for speed and wind of wind. In order to improve the dynamic of system and keep the stability of power output, the model free controller is performed in the wind turbine pitch systems. Next, the MATLAB Simulink is applied to build the control system. The simulation results show that the stability of wind power system can be improved through adjusting the angle of turbine pitch with different wind directions, resulting in excellently ability to operate the system. On the other hand, the model free controller is used as decision system in the wind generators, and the operation results consistent with simulation results. Thus, the wind power pitch systems based on model free controller can optimize the stability for wind generators.