Abstract: In order to control soil and water loss on excavated slope in a scientific manner, we conducted artificial simulated rainfall field experiment by setting up five rainfall intensity levels (30,60,90,120,150 mm/h) and three slope gradients (10°, 20°, 30°). We systematically investigated the relationship between excavated soil slope erosion rate and rainfall intensity, slope gradient, runoff rate, flow velocity, shear stress and stream power under different scenarios. The results show that there is no significant correlation between excavated soil slope erosion rate and slope gradient with 95% confidence interval; however excavated soil slope erosion rate is strongly correlated with rainfall intensity, and the combination effects of slope gradient and rainfall intensity (I x S) with 99% confidence interval. The excavated soil slope erosion rate is calculated using three common inter-rill erosion models, and power function slope factor is more applicable in terms of the simulation effects. Hydrodynamic parameters used in calculation include runoff velocity, shear stress and stream power, and stream power appears to be the ideal parameter for describing dynamic process of inter-rill erosion.