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Changes of micro-topography were closely related to the rill erosion process,and consequently affected the runoff and sediment yield process.In this study,simulating rainfall was applied to study the impact of vegetation patterns with lower coverage (25%) on soil erosion process in the slope gully system (SGS).A Trimble Geosystems HDS ScanStation 21 terrestrial laser scanner (TLS) was used to get the micro-topography of the rill in SGS.