According to moisture content in sand layers of the drilling sections in Haizetan Town of Jingbian County of Shaanxi Province, Mu Us sandy grassland, we studied the characteristics of moisture distribution in sandy lands, existing forms, water balance, supply of atmospheric precipitation to groundwater and appropriate vegetation. The result showed that variation of moisture within the depth of 500 cm was that the upper part contained less water and the lower contained more. The moisture content were found also high both below the depth of 200 cm in grassland and below the depth of 300 cm in shrub land. Sand moisture in grassland was significantly higher than that in shrub land. The moisture content of grassland ranged from 1.0% to 6.0%, with an average of 3.4%, and that of shrub land was 0.7% to 2.8% with an average of 1.5%. There were film water exceeding 3% and gravity water exceeding 5% below 200 cm on the sand section in grassland, which indicated the obvious supply of precipitation to groundwater. While the sand layers in shrub land was usually lacking of gravity water and high content of film water, it suggested that supply of atmospheric precipitation to groundwater was actually weak in the area. The important reasons why this area has positive water balance were high infiltration rate and small evaporation effect of sand layers, in addition to more precipitation. Owing to much rainfall in sandy lands of Jingbian County, active layer of sand moisture distributed at the depth of 200-300 cm, which was 100 cm to 200 cm deeper than that of desert area. Variation of moisture in the sand layers showed that sand moisture in the area could meet the needs for the growth of drought-resistant shrub, which was suitable for the development of shrub with good sand-fixing effect.