Based on the water stress field experiment of water wheat in arid region, the growth of winter wheat, water using and the character of soil water movement were investigated, and one-dimension soil water model containing root water uptake was presented in this paper. The model was used to simulate transpiration, evaporation, root, water uptake and water movement of soil water under different water stress condition .The result indicate that at development prophase of winter wheat the depth of root water uptake is up 80 cm, and that the valum of root water uptake which is a small proportion of whole root water uptake increased at under layer. The analysis based on the growth data measured of root show that the root under water stress condition during metaphase of growth stage premature senility and grow slowly after rewatering at anaphase of growth stage, and the effect of moderate water stress is more than water stress weightily after rewatering.