Based on geostatistics, spatial variability of soil organic carbon(SOC) and total nitrogen(TN) in Sidigou watershed on the Loess Plateau were analyzed. 46 sampling sites were collected in the watershed according to different land uses and different positions along the slope transect. The variogram was estimated by residual maximum likelihood(REML) and the method of moments(MOM). The Kriging method with the better variogram was selected by cross-validation method to conduct the geostatistics interpolation. The results showed that:(1) The variogram by REML is almostly more accurate for Kriging method than that by MOM.(2) Soil depth affected the spatial variation of SOC content more greatly than that of TN content. SOC content and its variation in surface soil were significantly higher than that in the lower soil layer.(3) The SOC and TN distribution was significantly affected by land use. SOC and TN content of shrubland and natural grassland was significantly higher than that of other land use types, and SOC and TN content for derelict land took the second place, then, it for derelict land, orchard and artificial grassland took the lowest level. This result indicated that grain for green project in small watershed of the Loess Plateau had an important contribution on the SOC and TN sequestration.