基于本体的语义检索是建立在语义网基础上的检索技术,它能提高检索的查全率和查准率.本文结合本体对构件库的检索进行研究,给出了基于本体的构件库检索框架以及检索流程,讨论了需求、规则的相关概念及其性质以及需求/规则的映射方法.在规则推理的讨论中,引入了匹配度和优先级算子的概念,并对匹配度进行了扩展,使检索结果能够进行全局排序. Ontology-based semantic retrieval is based on the semantic Web based retrieval technology, which can improve the search recall rate and accuracy .This paper combines ontology to retrieve component library, gives the ontology-based component library retrieval framework As well as the retrieval process, and discusses the related concepts and their properties of demand and rules as well as the mapping method of requirements / rules.In the discussion of rule reasoning, the concept of matching degree and priority operator is introduced and the matching degree is extended, Enables the search results to be globally sorted.