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Taken Digital Elevation Model (DEM) of Liangshui Nature Reserve of Heilongjiang Province as data source, raster characteristic values of topographic factors were acquired by GIS technology in order to calculate flow path and slope rate of change for each cell. Then gully net was extracted automatically with hydrologic processing platform by the development of ArcGIS Engine9.3. After gully was classified according to flow accumulation, then was compared with existing water system acquired by Remote Sensing interpretation method. At the same time, taken slope, aspect and topographic position as index, valley shoulder line was calculated by combining with characteristic values of topographic factors with four direction method. Risk evaluation unit of potential gully was established, and risk index was calculated, then risk grade was evaluated. In the end, spatial distribution character was analyzed by combining with forest resource inventory data, thus this study would be mainly applied for technical support of planning and improving forest water and soil conservation.