In order to quantitative evaluate the wind erosion effect of wind speed in wind tunnel center, vegetation coverage and their interaction，orthogonal experimental design and wind tunnel testing in situ field was adopted. The soil erosion experiment of grassland was completed. Test results were analyzed by using grey correlation, range analysis and partial least-square regression theory. The results showed that the sequence of factors influencing on sediment transport rate from larger to little was the center wind speed of wind tunnel, vegetation coverage, their interaction.