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.The key of lithology analysis in Three Gorges lies in analyzing the relation between the vegetation on the surface layer and the lithology and searching for the method which can eliminate the influence of the vegetation and directly extract the lithology information.In the paper we mined the association rules of the vegetation and lithology aiming at the area of Three Gorges.The authors pile the remote sensing image with the geological graph，compute the vegetation index image NDVI，choose the points in each stratum，analyze the relation between the NDVI value and the lithology in each point and based on the algorithm of concept grid mine the association rules of vegetation and lithology in the stratums of T₁j²，T₁j³，T₂b¹，T₂b² and T₁d in Three Gorges.

Key words: remote sensing image, lithology analysis, association rule, vegetation

摘要： 三峡库区属于南方高植被覆盖区域，岩石上部覆盖着较厚的土壤和茂密的植被，因此岩性分析比较困难，尚无成熟的方法可循。三峡库区遥感岩性分析的关键在于分析表层植被与岩性的关系，寻找消除表层植被的影响直接提取岩性信息的方法。针对三峡库区这一地形复杂、地质灾害频繁、土壤植被发育的地区分析和挖掘出岩性和植被的关联规则；通过将遥感影像与地质图叠加，计算植被指数NDVI图像，在各地层内随机选点，分析各点的岩性与NDVI值的关系，基于概念格算法和规则提取，挖掘出三峡库区嘉陵江组二段T₁j²，嘉陵江组三段T₁j³，巴东组一段T₂b¹，巴东组二段T₂b²，大冶组T₁d等地层的岩性和植被的关联规则。

关键词: 遥感影像, 岩性分析, 关联规则, 植被