In order to better understand the effects of soil erosion on soil labile organic carbon of slope farmland,we studied impacts of soil redistribution caused by soil erosion on spatial variations of soil organic carbon and labile organic carbon in sloping farmland in mountainous area of northern Sichuan,China,by using ~(137)Cs tracer technique and analyzing soil physicochemical properties.The results showed that in mountainous area of northern Sichuan,both water erosion and tillage erosion contributed to soil erosion on slope farmland. The lowest ~(137)Cs concentrations were found at the top of sloping farmland,showing that intensive tillage caused severe erosion at upper slope positions.Distribution of soil organic carbon and labile organic carbon were significantly affected by soil erosion,and contents of soil organic carbon and labile organic carbon showed significant positive correlations with ~(137)Cs concentration.The contents of soil organic carbon and labile organic carbon were lower at upper and middle slope positions(where ~(137)Cs concentrations were lower)than at lower slope positions(where ~(137)Cs concentrations were higher).Therefore,distribution variation of soil fertility should be considered in fertilization management strategies of sloping farmland in mountainous area.