A vegetation and wind-sand coupling model was applied to simulate soil water replenishment, biomass and wind erosion in Naiman County from 1987 to 2002. The simulation shows that soil water replenishment has an obvious correlation with precipitation. Water replenishment is higher in Spring and Summer and lower in Autumn and Winter. Biomass has the highest value in Summer and may remain at a rather high level if with an adequate precipitation in Autumn, or falls quickly if without adequate precipitation. The value of biomass in Winter and early Spring is relative low. The larger biomass appears in the south and lower regions and around the river. Wind erosion is higher in early Spring and lower in Summer and increases in Autumn and remains steady in Winter. The higher wind erosion appears on northern plain land and in areas with lower vegetation coverage.