Abstract: Abstract：The western Guangxi-southeastern Yunnan area is covered with thick vegetation, and hence the extraction of geological structure information from RS images meets with difficulty in that the land cover types constitute the major information in RS images. Land cover types must be removed in extracting geological structure information. In this paper, the components of geological information extracted by the K-L method were used for effective elimination of the land cover information. Geological structure information was extracted by using gray level co-occurrence matrix and directional detection. Field inspection reveals that the precision of the results can be evaluated. The results show that the precision of extracting the geological information, especially the precision of extracting small structure information, is fairly high. Nevertheless, the circular structure information cannot be effectively extracted, and the land cover still affects the results to some extent.