关键词: 遥感影像, 岩性分析, 规则, 三峡

Abstract: Three Gorges is the south area in which there covers thick soil and flourish vegetation on the top of the rocks，and the lithology analysis is very difficult.There are also no mature methods on this aspect.lithology analysis is maken at the area of Three Gorges.Based on the area of object-oriented the three sorts of indexes in spectrum，texture and vegetation covering are established.By pilling the remote sensing image with the geological graph，this paper mines the classification rules in the stratums of T₁j²，T₁j³，T₂b¹ and T₂b² in Three Gorges with C5.0 algorithm and provids the important information and knowledge for intelligent classification and intepretion of lithology in Three Gorges.

Key words: remote sensing image, lithology analysis, rule, Three Gorges