The Sunjiacha Basin of Lanzhou, Gasu Province was cited as a case for study. Geostatistic analysis was done of the data of soil moisture measured in that region during 1982, 1983 and 2011 for vertical variability of the soil moisture. Results show that the spherical model fits very well the vertical distribution of soil moisture in all the lands different in land-use (terrace field, waste slope, slope farmland and woodland) in wet years, quite well only in terrace field and woodland and not in slope farmland and waste slope in normal years, and still to some extent in terrace field and woodland in dry years. Soil moisture in slope farmland and waste slope varies randomly in distribution, and even if in the rainy season its spatial autocorrelation is also very weak. The vertical variations of soil moisture in all the lands and in all the years demonstrate a significant seasonal trend and go within the range of 1.687 ~ 3.404 m, which tallies basically with the extend of variation of the soil properties measured in the range self-similarity.