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Below the rated wind speed, variable speed constant frequency wind turbine should be reliably controlled to ensure the maximum wind power tracking. Without estimating the wind, this paper put forward a kind of wind turbine maximum power tracking method, firstly, by using the extended Calman filter to estimate wind turbine speed, a PI controller is used, wind turbine torque estimation is given, secondly, torque feed forward controller which wind turbine torque and speed estimation are the input is used to control the generator torque, to achieve maximum power tracking of low wind speed. Simulation platform is built in Matlab/Simulink software, the simulation verifies the effective of estimation and the correctness of control.