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Water and soil erosion is one of the most serious global environment. In Yulin Distract this phenomenon is very serious. Based on DEM and other data, using RS and GIS technique, based on general soil erosion equation RULSE model, The study has calculated the quantity of invaded soil in different years, completed the spatial distribution picture of the invaded soil, carried on the dynamic research on water and soil loss and analyses the factors in Yulin. The result indicated that, on the whole soil erosion in Yulin has been improved in some certain, due to the station and local government's policies and behaviors in recent years.