Abstract: To elicit and reuse requirements of C4ISR system accurately，a multiple ontology framework for requirements elicitation and reuse is proposed.This paper presents the requirements modeling process under this framework.Firstly，a goal model is constructed，and then the goal in the model is used to search the domain knowledge base，if there has a matched goal in the knowledge base，the corresponding requirements about the goal can be extracted，otherwise，the concept description frameworks directed by top level ontology are used for user to present requirements.Finally，the eventually requirements model are the combination of the extracted requirements and the newly created requirements.This process can both reuse the requirements and direct user to present new requirements，so the quality of requirements model and the modeling efficiency can be guaranteed.

Key words: C4ISR system, domain knowledge reusing, requirements modeling

摘要： 为了准确地获取和复用C4ISR系统需求，提出基于多本体的需求获取与建模框架。详细介绍了在此框架下进行需求建模的过程，首先明确用户的目标模型，然后使用目标对已有的领域知识库进行查询，如果发现匹配的目标，则利用目标-任务的映射关系抽取相关知识，如果没有匹配的目标，则生成概念描述框架引导用户提出需求，最后将两部分需求合并形成最终的需求模型。需求建模过程一方面能够复用已有需求，另一方面能够在本体的引导下提出新的需求，保证了需求模型的质量和建模的效率。

关键词: C4ISR系统, 领域知识复用, 需求建模