According to the theory of incompressible fluid,flow field in wind tunnel model was simulated by fluid simulation software after loading revised wind speed formula of entrance. It was proved to be reasonable by comparison of the experimental data and simulation results,modified wind tunnel model was also built and compared.The difference of wind energy utilization rates was obtained by the integral operation of entrance and exit velocity in the fluid domain.All calculated results show that modified model can be used to increase the air flow rate further and improve the wind energy utilization rate.