In view of the problems of disturbance caused by bidirectional fatigue loading and the big control difficulty and inaccuracy caused by big blade inertia,a new method of bidirectional fatigue loading of wind turbine blades based on electromagnetic force was proposed.Based on the research of the fatigue loading method,a new method of double axle fatigue loading of wind turbine blades was proposed.The model reference adaptive control algorithm with adjustable gain was applied to the electromagnetic bidirectional fatigue loading system of the wind turbine blades.By using this algorithm,the output of the reference model could be tracked continuously according to the internal frequency change of the electromagnetic fatigue loading system.Combined with the previous research results,a biaxial fatigue loading model test platform driven by electromagnetic force of wind turbine blades was established,and the control effect of the adaptive algorithm was verified in field test.The results show that in the swing direction,the average tracking error of the reference adaptive control algorithm is within 10% and within 7% in the shimmy direction;compared with the traditional PID algorithm,the proposed algorithm has better tracking ability,better robustness and anti disturbance ability，and the control performance has been greatly improved.