Abstract: An M-shaped tip winglet is proposed based on the model of SD2030 airfoil blade,and the improvement of blade output power proves the success of the geometric design of the winglet. On this basis,the sensitivity and regularity of the effect of the winglet on the output power and vibration frequency of the blade are investigated through experimental tests. The research reveals that the winglet has better gain effect on the power capacity of blades under different working conditions,and the gain effect will increase with the increase of inlet wind speed and blade rotation speed. The reduction of natural vibration frequencies of the first and second order antisymmetric modes of blades by a winglet is much higher than that of the same order symmetric modes. At the same time,the winglet has the ability to adjust the blade to pass through the resonance band,which is of great practical significance to the design and performance improvement of the blade for optimum speed and avoidance of resonance.