信息检索中的语义问题一直是研究的热点。本体作为能描述语义能力的建模方法,在信息系统领域得到广泛的关注和应用。文献犤1犦犤2犦研究了在不同本体之间构建代数系统来解决分布式系统之间的语义异构。文章研究单个本体内的代数系统,给出了该代数的定义和相关概念,并结合实例指出该代数系统有利于提高信息检索的质量。 Semantic problems in information retrieval have always been the focus of research. As a modeling method that can describe semantic competence, ontology has been widely concerned and applied in the field of information system. The literature 犤 1 犦 犤 2 犦 studies the construction of algebraic systems between different ontologies to solve the semantic heterogeneity among distributed systems. This paper studies the algebraic system in a single ontology, gives the definition of the algebra and related concepts, and points out that the algebraic system is helpful to improve the quality of information retrieval.