PURPOSE: A wind power generation system is provided to individually control the pitch angle of each blade using a data table about the rotation angle of the blade and the wind velocity according to altitude. CONSTITUTION: A wind power generation system comprises a plurality of blades, a spindle, a nacelle, an anemometer and a control device. The spindle is connected to a plurality of blades through a hub and revolves along with the rotation of the blades. The nacelle generates electricity using the torque of the spindle. The anemometer is installed in the nacelle. The control device controls the pitch angle of each blade using the rotation angle of each blade and the velocity of wind, and comprises a wind velocity measurement part for measuring the wind velocity using the information transmitted from the anemometer, a storage part, a rotation angle sensor, a controller and a pitch driving part. The storage part stores a data table about the rotation angle of the pitch according to the rotation angle of the blade the wind velocity. The rotation angle sensor measures the rotation angle of each blade. The controller decides the pitch angle of each blade using information about the wind velocity, the rotation angle of each blade and the data table. The pitch driving part changes the pitch angle of each blade according to the control of the controller.
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