Patterns of soil organic carbon (SOC) vary widely across the landscape and land uses leading to large uncertainties in the SOC budget especially for agricultural landscapes where water erosion redistributes soil and SOC across the landscape. Samples from 448 sites (0-20cm) and 33 sites (0-200cm) were collected during May 2004 at Wangdonggou watershed in the gully region of the Loess Plateau to measure SOC, and analyzed the effect of land use, landform (tableland, slope land, and gully) and depth on SOC. Soil sampling units were defined on the basis of land form (tableland, slope land, and gully) and land use (arable, orchard, grassland, and woodland). There was significant variation in SOC concentration across the landforms (P > 99.9%). For the top soil of 0-20 cm, SOC concentration was greatest at the gully position (9.1 g kg-1 ), next was at the tableland position (7.8 g kg-1), and least (6.8 g kg-1) at the slope position. For the soil profiles (0-200 cm), the average of SOC concentration was greatest at the table land position, next was at the slope position, and least at the gully position. Land use impact SOC across the three landforms significantly. For the table land position, SOC content in 0-40cm under grassland was significantly higher than crop land and orchard. For slope land position, SOC content in 0-140 cm under grassland and woodland was significantly higher than under crop land and orchard. For the gully position, SOC content across the depth under grass land was not significantly different from woodland. On the tableland, SOC in 0-20 cm varied between 6.49 and 8.56 g kg-1, on the slopleland, the range of SOC concentrations increased (5.79-9.95 g kg-1), and varied most in the gully (5.79-10.64 g kg-1). Our study also indicates that geomorphic position and land use are important for estimating SOC density and stock within a watershed in the region.