First，this paper describes the operating characteristics of the wind turbine，then deduced the VSCF wind power system wind speed and wind turbine power of mathematical relations，proposed a VSCF wind generator maximum power capture method that is based on the power given maximum wind energy tracking control strategy，analysis of the specific process control by the maximum wind power tracking. Then according to the double-fed motor operating characteristics，the establishment of a doubly-fed machine in a rotating coordinate system of stator active and reactive power of mathematical expressions，then proposing decoupling control strategy that is field oriented vector control strategy，and an improved flux observer was utilized. Finally the simulation model was established based on Matlab /Simulink，the simulation analysis is carried out，simulation results verify the correctness and effectiveness of the control strategy.