Abstract: Throughfall, stemflow and canopy interception, water retaining capacity of the litter, variational soil water content, soil losses and surface runoff of the plot of retained litter and lost litter as well as the input of elements (N, P, K, Ca and Mg) by rainfall and the output of elements by surface soil erosion in evergreen broad-leaved forest and Pinus yunnanensis forest have been studied in Tonghai county during the rain seasons of 1986 and 1987.The results showed that the ability of regulating rain water of two forests was different. In evergreen broad-leaved forest, average annual percentage of canopy interception was 18.2% of the rainfall and was 13.4% in Pinus yunnanensis forest. The average annual percetage of stemflow for two forests was only 0.3–0.5% of the rainfall. The soil water content of evergreen broad-leaved forest was 15–40% higher than that of Pinus yunnanensis forestThe amount of soil erosion in two forests were closely corre lated to the litter loss. After loss of forest litter, the amount of soil losses and surface runoff increased by 11.4 and 1.3 times in evergreen broad-leaved forest and 12.9 and 3.3 times in Pinus yunnanensis forest. The input and output of nutrients in two forests also were different. The amount of NH4-N, P, K, Ca and Mg input by rainfall in evergreen broad-leaved forest was 15.2, 0.5, 50.4, 18.9 and 8.6 kg/ha.a respectively, and the same quantities in Pinus yunnanensis forest were 11.2, 0.6, 40.2, 11.4 and 7.5kg/ha·a respectively. The total amount of the elements output by soil erision in the former forest was 1.6kg/ha·a and that for the latter forest was 0.8 kg/ha.a, and the amount of the elements by soil erosion in two forests increased by 2.4 and 4.2 times respectively after loss of litter layer.