In this paper, we described the latest progress in the study on seasonal surface soil erosion and its coupling relationship to lake sedimentation using ⁷Be. Meanwhile,¹³⁷Cs reliability for tracing soil particle accumulation and for sediment dating was confirmed. Differentiation of ²²⁶Ra/²²⁸Ra activity ratios in different geochemical fractions in the soils could be used as a parameter to trace accumulation and/or erosion of soil particles. ²¹⁰Pb geochemical behaviour in the soils and sediments and its effecting factors was studied under different conditions. The coupling relationship between soil erosion rates traced by ²¹⁰Pb and lake sediment ation proved that ²¹⁰Pb was reliable for tracing accumulation rate of soil particles.