基于角色的访问控制（ＲＢＡＣ）技术随着网络的迅速发展而发展，在ＲＢＡＣ中，角色是重要概念，它根据用户在组织内所处的角色进行访问授权与控制，通过角色沟通主体与客体。该文提出了用可视化标准建模语言ＵＭＬ的类图、用例图和交互图（合作图、顺序图）来描述了 ＲＢＡＣ的相关概念。有效地帮助系统开发人员理解ＲＢＡＣ模型和建立基于角色的系统。 Role-based access control (RBAC) technology evolves with the rapid development of the network. In RBAC, role is an important concept. It conducts access authorization and control based on the role of the user in the organization and communicates the subject and the object through the role. This paper presents a class diagram, a use case diagram and an interaction diagram (cooperation diagram and sequence diagram) of the visual standard modeling language UML to describe the related concepts of RBAC. Effectively help system developers understand the RBAC model and build a role-based system.