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Researches conducted for Mind mapping application in primary education semantic ontology, while considering unique characteristics of primary education, found there were rare widely used ontology libraries and few connections between ontology libraries for information sharing and reuse. In addition, primary semantic ontology library lack precise definitions of the semantics. This paper proposed a solution based on cluster structure derived from mind mapping by providing logical description of the ontologies to precisely define semantics; Meanwhile, tags were adapted to associate different ontologies to form ontology library.