Abstract: A new method is developed to measure the near wake distribution characteristics of wind turbine,by which can obtain the change law of the wake wind velocity in the vertical and horizontal directions. For a coastal beach wind farm,two UAVs（Unmanned Aerial Vehicle,UAV）equipped with anemometers are adopted to measure the near wake. Results show that,in the vertical direction,the wind velocity ratio of wake and inflow decreases firstly and then increases with the increase of the height from 1.0D to 2.5D,D is the diameter of the wind rotor,and the minimum value is 0.53 to 0.68 at the central axis of the hub,and the wind velocity ratio is asymmetrically distributed along the central axis of the hub. There are two minimum values 0.56 and 0.50 appears at 0.5D,which appears at the top and bottom wind rotor respectively. In the horizontal direction,the wind velocity ratio decreases firstly and then increases from left to right along the radial distance from 1.0D to 3.0D,and the minimum value is 0.54 to 0.78 at the central axis of the hub. The wind velocity ratio is symmetrically distributed along the central axis of the hub,and tends to expand with the increase of downstream distance of the rotor. Moreover,the ratio formula of vertical wake to inflow wind velocity profile is given,which can be used to predict downstream wake velocity profile of wind turbine in class A wind field.