Abstract: Ontology is the cornerstone of the semantic Web.It plays the more and more important role in the semantic Web.The purpose of ontology evolution is dynamically to adjust itself in the changing environment.The thesis start from the users log on domain ontology，used Aporior mining algorithms to get frequent and frequent users of the operating path.Through the analysis of frequent path，and get the advice of the ontology evolution and realize the method in experiments.The experiments prove the method is effective.