Aiming at the complexity and uncertainty of large-scale system requirements, this paper introduces the concept of ontology, through the requirement ontology model, the system requirements are formed into a unified modular unit, and each modular unit has a structured logical relationship. Finally, the structured and modularized requirement model will form a complete requirement management platform in the DOORS tool, which will realize the basis of civil aircraft requirement management and improve the capability and efficiency of civil aircraft product design.

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