Abstract: I3y analysing the requirement of ontology evolution, it proposed a model of ontology evolution requirement which can be generated automatically. By segmenting the domain texts,we got the candidate concepts,and got the final key concepts by restoration, extraction, conciseness and shift This paper adopt ATF、PDF algorithm to get the key candidate concepts,and bring in the thesaurus,which is used to convert the natural concept to normalized format. Then, we decomposed the compound demands of evolution to atomic changes, and implemented an evolution system by using corresponding evolution strategy. The experiment result indicates the model can get a good result by evolution and anal sis of the experiment.

Key words: Ontology evolution, Evolution recauirement, Auto-generated, ATF、PDF algorithm