Abstract: In this paper,hierarchical structure and its expressional method of micro-fractography information are described based on fractographics.The principle and methodology of fractographs'information processing system built on the information relation are introduced.In the method,the determinating process of information is described as two general aspects of operation abstractivly,and the features extraction is completed in the two aspects respectirely,including the pre-processing,determination and classification,special feature image processing and image,text imformation management.Some operating results are listed in this paper.