This paper analyzed the stator flux oriented vector control theory for doubly fed induction generator. The control strategy of grid connected based on speed feedback, and the arithmetic of tracking the peak power independent of the turbine characteristics and air density, were used in the system. 110 kW VSCF doubly fed induction generator wind power system was constructed in the laboratory, which realized the decoupled control of the active power and reactive power for stator output and the control of maximum power point tracking.