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The requirement analysis has become a core task in the software engineering and the software development. This paper presents an ontology modeling methodology in requirement analysis, including the requirement analysis of ontology, the acquirement of ontology concepts, the graphical representation of ontology, the acquirement of axiom, and so on. As a kind of sharing resource, domain ontology is not only helpful of understanding the related background knowledge and communication with each other, but also provides requirement reuse. Finally we validate the method by cases.