Abstract: In this paper,the conceptual principles of GIS(geographical information system)are introduced,and the feasibility and advantage of GIS in processing geological information are discussed.Then the general procedure of the GIS analysis is presented with the exam-ple of the Late Palaeozoic sedimentary facies and palaeogeographic study of Hebei Province.At last,some problems concerning the GIS application are approached.The au-thors contend that GIS will be of great potential in processing geological information with the uninterrupted development of GIS technology and relevant subjects in the near future.