Abstract: The authors aimed at the problem of declination and low effect of current wind prevention and sand fixation system, flow field characteristics of single Ammopiptanthus and windbreak characteristics of different configurations were studied by the method of artificial simulation based on the biological properties of Ammopiptanthus. The results show that: (1) single Ammopiptanthus had no significant effect on the wind speed reduction on both sides, wind speed would be significantly reduced when the wind crossed the plant, and the reduction rate could reach 59.77%, there was a bradytelic calm zone in the leeward side within the scope of 1-3 H, and at 7 H the, the wind speed was equal to that in the wilderness, which formed the wake zone; (2) single Ammopiptanthus had similar effect on sand collection and speed; (3) the indproof efficiency of line configuration was the best, then was that of uniformity and the windproof efficiency of ondemond was the lowest. Sand transport rates of the three configurations all declined within the margin of 5 H in the forest, and the declination was obvious within the margin of 1, 3 H in the forest.