Abstract: This paper analyzes the Liangjiaping of Tianshui, runoff of Xifeng River, Suide Xindiangou from 1945-1963 slope runoff plot and sediment data for quantitative analysis. The relations of slope runoff and erosion sediment of Suide and Xifeng area is y=ax+b linear regression, and the relations of slope runoff and erosion sediment of Tianshui area is power function. Considering the limitations of existing data, according to the features of soil erosion on the loess plateau rainfall duration was shorter, the equation M=KH^a(I_平均)^b(I_最大)^b was introduced, the multiple correlation coefficient increased to more than 0.7.