Soil water is the first restrictively factors in the arid-semi arid sandy ecosystem, so the study of the relationship between soil moisture and plant is advantaged to protect and restore the natural sandy ecosystem. Based on the field observation of soil moisture and precipitation in Horqin Sandy Land during the growing season in 2009 year, we explored the coupling relationship of soil moisture and plant coverage. The result showed that soil moisture had obvious stratification structure on soil profile, and the depth distribution profiles of soil moisture were as follows:the greatly changed layer (0-40 cm), the slowly layer (40-100 cm) and the steady layer (100-180 cm). The plant coverage had significant effect on soil moisture change, and the soil moisture content varied considerably between sample plot with different coverage, in which the relationship between soil moisture and coverage liked inverted "V". In addition, the responses of soil moisture to precipitation also had difference under different coverage, which was most sensitive under 13% plant coverage, but weaken under 28% and 46% coverage. Considering the moisture variations with plant coverage, our results suggested that the logical vegetation collocation will increase the precipitation use efficiency, as well as beneficial to form the mutual balance between soil moisture and vegetation, further conducive to the stability of sandy ecosystem.
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