Abstract: Based on the experimenal results that repeat-loading has no influence on the bearing-capacity of sand and that sand thrust acting on wheel keeps unchanged during the wheel multi-passing on it, and with Bekker' s "pressure-sinkage" and "shear-displacement" equations, a method is presented in this paper, by which the parameters of "pressure-sinkage" and "shear-displacement" properties of sand under multi-pass condition can be determined. Therefore the tractive performance of wheeled vehicle on sand can be predicted more accurately by taking account of the effect of wheel multi-pass on the sand properties of "pressure-sinkage" and "shear-displacement".