A new physically based soil erosion model LISEM, has been developed by the scientists of Netherlands,which can be used to predict soil and runoff and to make soil conservation and landuse plan in small catchment.The varied processes of erosion is incorporated in the model. LISEM is one of the first examples of physically based models that is completely incorporated in a raster GIS and digital remotely sensed data and can be easily applied in larger catchments. A-l though the model has several advantages over other models,it is far from perfect,so more at tention should be paid to the spatial and temporal variability of soil properties and description of soil erosion processes.