The using depth of soil water and water consumption by littleleaf Caragana korshinskii is the base of studying the relationship between soil water and the plant growth. The dynamic of soil water were continuously measured with a neutron probe in wasteland and young peashrub forest land during the period from 2002 to 2006. Results showed that in 2002, the depth to which plant use soil water was increased from about 2 cm sowing on 24th June to 90 cm on 1st Sep, 110cm on 15th Oct, 170 cm on 1st Nov, and 220 cm on 15th Nov. The using depth of soil water and water consumption by littleleaf peashrub were increased and the amount of soil water storage was reduced with increasing age apart from the wet year (2003) in which the amount of soil water storage was increased by 122.8 mm in the 2-year-old peashrub forest land. It was also discovered that soil desiccation at which water content was smaller than and equal to the upper limit of wilting coefficient occurred at the soil depth of 100 cm in the 3-year-old peashrub land and soil desiccation occurred in the soil layer from 60 to 300 cm in 5-year-old peashrub land. Some effective measures should be taken to control plant density and growth in order to reduce soil water consumption and realize sustainable use of soil water.