A predicting equation for soil loss is derived by means of numerical analysis of the data from the experimental plots on eroded red earth developed on granite in Southen China. The equation is A₁=4·y_s·K·LS where A₁, is amount of soil losses y=5.459-0.472x₁+0.128x₂+1.715x₃-14.041x₄,x₁, to x₄, refer to rainfall, rainfall intensity, volume of runoff anti runoff coefficient respetively; K is erodibility and LS gradient-length of slope. This equation could be used for predicting the amount of soil losses in granite region of South China. Another predicting equation derived through soil erosion investigation and reservoir sediment measurement in the region of the Yangtze Gorges is A₂=0.8351·R·K·LS·C^-2.3,where A₂ is soil losses,R and C are rainfall factor and coverage of vegetation respectively, K and LS are the same as mentioned above. By using this equation, the soil losses of the region of Yangtze Gorges could be calculated.