Abstract: In order to study how to reduce the wind pressure and noise on wind turbine blade surface,the inhibitory effects of plasma actuator which is applied on the leading edge surface of wind turbine on the wind pressure and noise on the blade surface were studied by numerical simulation. The results show that the blade noise is mainly generated in the negative pressure area of the blade tip leading edge. When the plasma actuation from leading edge to trailing edge is applied,the negative pressure peak at the leading edge of the blade pressure side and the negative pressure at the middle of the blade pressure side increases slightly,and sound power level for noise increases. However,the results are opposite to the former when the plasma actuation from the trailing edge to the leading edge is applied. Taking the plasma actuation from trailing edge to leading edge and the inflow velocity of 10 m/s as an example,the noise sound power level of wind turbine blades can be reduced by up to 7.72 dB（12.19%）and 7.56 dB（15.25%）when the speed of the wind turbine blade is 17.5 r/min and 14 r/min respectively.