Abstract: For the complex flow field characteristics of vertical axis wind turbine（VAWT）, an active flow control method based on the synergistic effect of blowing and suction was proposed to suppress the dynamic stall phenomenon caused by periodic changes in the angle of attack. The effect on the aerodynamic performance of the VAWT was investigated by simultaneous suction and blowing at the leading edge of the airfoil suction surface and the trailing edge of the pressure surface using high-precision numerical simulations. Results show that the synergistic jet is most effective in improving the wind energy utilization at low to medium tip speed ratios, which can significantly slow down the dynamic stall of the blade, eliminate the negative torque of the whole machine, and then reduce the centrifugal force of the blade and increase the stability and safety of the wind turbine.