The wind speed dynamics model in the whole rotor disk area was obtained, based on analysing wind shear and tower shadow for three-bladed upwind horizontal axis wind turbine. The aerodynamic data, the blade geometry parameter, the hub height, the wind speed at hub height, the wind shear exponent, the blade radial distance, the tower radius and the overhang distance were taken into account, and the aerodynamic load was calculated and analysed for 2 MW wind turbine. These works lay foundation for the further study of the individual pitch, the power control, the fatigue and the dynamical stability for wind turbine.