In order to reduce the imbalance load resulting in fatigue of wind turbine, the pitch moment and yaw moment of the wind wheel swept surface caused by the wind shear characteristic and tower shadow effects were analyzed according to aerodynamics principle, and the independent variable pitch control strategy based on load feedback was presented. Through the d-q coordinate transformation, the three-phase rotation coordinate system is converted to two-phase static coordinate system for the system control. The simulation results of Bladed semi-object test platform verify the rationality and feasibility of the control strategy.