A typical undulating tract of farmland in the Black Soil region of Northeast China was taken for a case study to analyze impact of soil erosion and deposition on loss, transportation and accumulat ion of SOC through measuring contents of water stable aggregates of different sizes, particulate organic carbon and aggregate-bound organic carbon in surface layers and typical soil profiles in different topographic positions.Results show that water stable macro aggregate, mineral-bound organic carbon (MOC) and aggregate-bound organic carbon decreased in content with increasing rate of soil erosion at three sampling sites on the upper slope, and the contents of particulate organic carbon (POC) and POC/ SOC ratios were lower at the deposition sites, especially in foot-slope, at the erosion sites, while the contents of MOC and MOC/ SOC ratios displayed a reverse trend.The depth distribution of organic carbon of various particle-size fractions at the foot slope was characterized by obvious accumulation and deep burying of eroded materials; and accumulation was getting more and more obvious with decrease in particle size of the organic fraction.The above-listed findings reflect that soil erosion tends to transport organic carbon associated with fine part icles and micro-aggregate, and then accumulates in depressed deposition sites.The eroded materials, such as micro-aggregates, particulate organic matter (POM) in the buried layer form stable macro aggregates through deep burying, which eventually promotes sequestration of SOC in the deposition sites.