Erosion pattern on geocell slope surface was studied using an experimental flume with varying slope.The range of slope degree was 50-350 and the range of flow discharge,1-2m³/h.The processes of runoff and sediment yields on the geocell slop surface were analyzed based on traditional measuring method.Results showed that due to the existence of geocell,a series of diamond-shaped rills formed along the edges of the geocells,which is substantially different from the scouring pattern on a natural slope.The accumulative erosion amount increased with the increased slope degree and discharge.Erosion on the geocell slope surface occurred in the early 10 min and the erosion amount decreased gradually in the same period.There was a positive correlation between the scouring erosion modulus on the geocell slope surface and slope degree at the same discharge.