Abstract: Taking the flexible tower of a large wind turbine as the research object, first analyze the tower structure dynamics and aerodynamic model, and combine the system dynamics model to study the feasibility of torque control on the right and left vibration damping control of the tower, through linearization the controllability rank criterion of the model is proved.Based on the measured values of the left and right accelerations of the tower top, the left and right vibration speeds of the tower top are obtained through the integration link to design a tower left and right damping controller.Finally, simulation and field tests verify the effectiveness of the algorithm, which can reduce the vibration value of the tower on the left and right, which is of great significance to ensure the safe operation of the wind turbine.