Abstract: In order to investigate the variation law of key characteristic parameters of atmospheric turbulence in mountainous terrain and its influence on wind turbine power, a large wind turbine at the ridge of a mountain wind farm in Yunnan Province was used as the research object. Remote sensing techniques were employed. The distribution characteristics of wind speed, wind direction, turbulence intensity, turbulent kinetic energy and turbulent dissipation rate of the incoming wind turbine flow were studied and the influence of the above parameters on the unit power was analyzed. The results indicate that the diurnal characteristics of the incoming flow parameters in mountainous terrain are obvious. In the vertical direction of the incoming flow, the influence area of the terrain is concentrated in the range of 79 m from the ground, and the turbulent kinetic energy is inversely proportional to the turbulent dissipation rate in the vertical direction. In mountainous terrain, the wind speed has a good positive correlation with the turbulent dissipation rate. The influence of the incoming flow characteristics on the wind turbine power varies greatly in different wind speed zones and the turbulent kinetic energy. The effect of turbulent energy on wind turbine power is 1.49%, but the effect of turbulence intensity on wind turbine power is as high as 4%.