Abstract: A simulation experiment was conducted to compare the effect of cutting and no-cutting at both slopes along a river on the rainstorm run-off in catchment,and a model was constructed.The results showed that the appearance of outflow and peak flow of surface run-off was later on forest slope than on forest-cutting slope.On forest slope,the duration was prolonged,and the peak flow and surface runoff were lower.These effects were more obvious as the slope gradient was bigger.When rain intensity was 1.98mm穖in^-1 and rainfall was 108.8mm,the peak flow and the total runoff on both forested slopes of gradient 15皐as 5% and 4% less than that on the cutting slopes,respectively.