Abstract: In this paper,a simple and effective method was used to improve the wake effect of the wind turbine and increase the power of the downstream wind turbine. An experiment was carried out to investigate the influence of different rotation directions of the blade on the wake of the wind turbine. The low-frequency PIV system was used to test the turbulence flow field produced by the NACA4415 airfoil and collect the data of the wake of the wind turbine. As the results,when two wind turbines arranged in tandem have different rotation directions,at the 1D（D is the diameter of the wind turbine）in front of the downstream wind turbine,the position of the tip vortex core shifts to the central wake region. And the flow in the external main region,due to the inducible effect,is sucked into the central wake region and blended with its flow,speeding up the axial velocity. For the 1D flow field data of the downstream wind turbine,the results show that the vortex core energy does not decrease,even though geometry structure of blade-tip vortex of the wind turbine downstream is“broken”. Finally,the factors affecting the power characteristics of wind turbines are discussed. The result shows that with the increase of the inflow angle of the downstream wind turbine,more wind energy can be captured. When the distance between the wind turbines is2D and the blades rotate counterclockwise,the power ratio is 4.70% higher than that rotate clockwise,and the increase of the power ratio gradually decreases with the increase of the distance.