Abstract: To mitigate the degradation of aerodynamic performance in vertical-axis wind turbines resulting from blade surface flow separation, a hybrid strategy integrating boundary layer suction with Gurney flaps was proposed based on active and passive flow control techniques. Computational fluid dynamic methods were used to evaluate the impact of this strategy on energy capture efficiency and overall aerodynamic performance. Results show that the combined use of outward Gurney flaps and suction control enhances aerodynamic performance more effectively than either approach alone. At a tip speed ratio of 2.33, the power coefficient increases by 47.6%. Moreover, this approach suppresses the formation and development of the leading-edge vortex, delays flow separation, significantly improves single-blade torque, overall tangential force, and airfoil pressure difference across various tip speed ratios, reduces the impact of stall on aerodynamic performance, and maintains stable turbine operation.