The application of RS,GIS and GPS to soil erosion fast investigation is a beneficial at tempt for the application of Hi-tech to production reality,and is also afrontier for the application study of“3S”in soil and water conservation.Soil erosion investigation is a quite complicated task.Based on the experience summary on erosion remote sensing investigation at different times,aiming at the existed technical problems in the third remote sensing investigation on soil erosion,we carry out some analyses and put forward some corresponding suggestions so as to consult with colleagues and to provide a reference for decision making.