Abstract: Flow pattern and hydraulic parameter characteristics are quantified under the rainfall intensities of 60,90,and 130 mm/h using the hillslope-gullyslope system including different slope gradients with the simulated rainfall experiment.The resups show that the hillslope runoff discharging into gullyslope or the increase of the rainfall intensity will result in the increase of the Reynolds number and Froude number and the shift of flow pattern from the stratum flow into torrent flow.The hillslope runoff discharging into hillslope-gullyslope system causes the decrease of the Darcy-Weisbach coefficient and the increase of the sediment delivery at the same time.