Ths study on the physico-geograpical environment of Erhai Lake focused on the suspended matter and recent deposition rates, 14 C, 210 Pb and 137 Cs methods were used to determine the ageand sedimentation rate, which was found to be 0.5 t0 2.0 mm/a, average of 0.9 mm/a. The authors calculated the budget of some elements by studying the deposition, and fuUnd that about 30% of nitrogen,and most of the phosphorous, were transported into the lake by the ediments. Ths study on the physico-geograpical environment of Erhai Lake focused on the suspended matter and recent deposition rates, 14 C, 210 Pb and 137 Cs methods were used to determine the age and sedimentation rate, which was found to be 0.5 t0 2.0 mm / a , the average of 0.9 mm / a. The authors calculated the budget of some elements by studying the deposition, and fu said that about 30% of nitrogen, and most of the phosphorous, were transported into the lake by the ediments.