The results in the paper are from statistical analysis of the examination data out of the experiments on 26 runoff plots during the period of 1985 to 1987 year, it clarifies the effects of the rainfall indexes in the gra-nite area of southeastern Fujian on the soil and water lossunderdifferentslope,anddifferent combinations of biological measures with engineer ing, and finds out initially the local rules of soil and water loss，at last itconsiders the biological measures to be the most efficient method to}prevent soil and water loss，the results of which provides reliable basis to conduct effective harness.