Based on GPS location, seven sediment cores were collected from different areas of Fuxian Lake. By analyzing the radionuclide profiles of ²¹⁰Pb and ¹³⁷Cs, the authors found that there were three obvious time markers of ¹³⁷Cs in all the sediment cores. In combination of the ²¹⁰Pb and ¹³⁷Cs dating results and historical data, the authors found that the modern sedimentation rates in different sediment cores (except FX6) of Fuxian Lake had a similar tendency, which can be marked off three stages :natural evolution stage, man-made disturbances stage and man-made transformation stage.