Simulating atmospheric boundary layer in environmental wind tunnel is the precondition of the research on the convection and diffusion of atmospheric pollutants.Based on the characteristics of the diffusion of pollutants in environmental wind tunnel,it should satisfactorily adjust simulation setup by experiment to model more accurately the partial atmospheric boundary layer in environmental wind tunnel and to determine the simulation scale in accordance with turbulence structure.When atmospheric boundary layer is simulated correctly,the diffusion of pollutants under different model scales in environmental wind tunnel is similar to that in atmospheric boundary layer.