With the introduction and using of the System 101,some satisfactory results on the mapping of soil erosion by using of LANDSAT MSS CCT's images were obtained.The results include the method of registering regional boundaries on CCT's images,and the selection of optimal process available for the mapping of soil erosion.Is praetice,the map of soil erosion in Xinggu County of Jiangzi Province was compiled and the area of eroded soils and agricultural fields in the region were ealculated.The conclusions of this paper are summarized as follows:1.Unsupervised classification is not suitable for image classification,at least in the mapping of soil erosion,but B classification is suitable for it.2.The key to image classification is the selection of training fields,of which the key iis the analysis of the image.3.Before image classification the regional boundary must be registered.4.The mapping of soil erosion by means of LANDSAT CCT's images is a more rapid,accurate method with low cost.