Abstract: The near wake flow field of the horizontal axis wind turbine under different yaw conditions was studied by numerical simulation method with two-way of fluid-solid coupling due to the interaction between the wind turbine blades and the flow field will lead to the change of the turbulence characteristics of the wind turbine near the wake in the yaw state. And the evolution law of the wake turbulence characteristics under different yaw angles was obtained. The results showed that speed loss ring was presented on the positive yaw side with the increasing of yaw angle and the range of this ring expanded continually. Meanwhile,the velocity loss at the blade root was affected significantly by yaw angle increasing,on the contrary,the velocity loss at the blade tip was few impacts. Compared with the positive yaw side,the velocity loss at the negative yaw side was reduced to a half. The variation of turbulence intensity on the positive and negative yaw side displayed an asymmetric variation when yaw angle was increased,while the influence of the turbulence dissipation positive on the positive yaw side was obvious than that of negative yaw side. The eddy viscosity became smaller gradually and the eddy viscosity at the position of 10° yaw angle was decreased half of that at the yaw angle was 5° position. The tubular circular vortex structure along the axial tip vortex became unstable and dissipated obviously,and the degree of dissipation breakdown of the vortex structure was more intensive after 15° yaw angle which resulted in a great impact on the aerodynamic noise of the wind turbine.