Abstract: Numerical method provide the experimental basis for choosing the best shape of turbine rotor and the blade size so as for wind turbine to reach excellent aerodynamic characteristics.Taking the wind turbine as the object,the numerical test technique was studied based on computational fluid dynamics theory and similarity theory.The wind turbulence mathematical model of the wind farm was established for considering the impact of terrain and wind shear effect.By using similarity theory,the three-dimensional numerical flow field was constructed and realized by computational fluid dynamics software Fluent.Dynamic wind speed and numerical experiment boundary conditions of wind turbine were defined by user-defined function （UDF）.Wind turbine aerodynamic performance was studied and the simulation of rotor was completed on the aerodynamic parameters,such as rotor surface pressure,rotor rotational speed and moment time-history data etc.The results show that the aerodynamic performance trend of wind turbine rotor obtained by using numerical test and field measurement would keep similarrity.