关键词: 本体, 语义相似度, 语义距离, 信息量, 共同分离祖先

Abstract: The research about concept similarity is very important in knowledge representation and information retrieval.Aiming at the problems of two traditional semantic similarity computation methods，this paper puts forward an integrated method based on ontology.This method integrates the graph structure of ontology with several kinds semantic influence factors and utilizes the concept semantic information fully to compute the semantic similarity between concepts.The experiment shows that the computation result is reasonable and this method is effective.

Key words: ontology, semantic similarity, semantic distance, information content, common disjunction ancestor