Run-off plot and rare earth elements tracing technology were used under artificial precipitation to study the slope land erosion in the South of China. The results showed that the erosion of slope land is correspond with intensity of the rainfall. Soil loss is mainly sourced from the down slope and mid-slope, and it accounts for approximately 90% of total. The upper slope only accounts for about 10%, and the down slope can reach about 50%. Impacted by the rainfall intensity, soil aggregate structure, permeability, and moisture, the quantity of soil erosion and content of rare earth elements are biggest in the first rainfall event, and lower in the second rainfall event than that in the first event but higher than that in other three rainfall events. Meanwhile,the following problems such as the importance and features of the erosion in the South of China, application of research results under artificial precipitation, the mechanism of sediment source in the slope were also discussed.

artificial precipitation；rare earth elements tracing technology；relative erosion amount；source of soil erosion