Abstract: On the basis of image preprocessing and collection of auxiliary materials, the paper put forward a kind of automatic category method for the land utilization patterns, in order to undertand the characteristics of complicated topography，diversification of land utilization，and great variance of remote sensing images in the Threegorge Region. Based on the professional imageanalysis softwareeCognition, the goal was achieved with the classification of selected samples, the selection of the most suitable wave bands, the establishment of identified functions. The decrease in the influence by the same thing with different spectrums, different things with the same spectrum，and border transitions was also obtained. The results of classification are common raster or vector forms, which can be compatible with other raster or vector analysis software conveniently. The research accomplished the classification of the main patterns of land utilization in the Threegorge Region with higher precision of verification, verifying the exploration of technological route and method to obtain information on land utilization in lagerscale survey by application of automatic classification of the remote sensing images.

Key words: obtain automatically, main types of ground objects, identifying functions, The Threegorge Region