And, the expanded RBAC model-ERBAC model and the formal description are given.

给出了扩展的RBAC模型—ERBAC模型，并给出了其形式化描述。

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ERBAC model is composed of three parts: system component, database and human-machine interface.

ERBAC模型的实现主要包括系统组件、数据库和人机界面三部分。

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This paper first describes the ERBAC mainframe of the management of authorization, and then gives the formal rules that ERBAC model must meet.

给出了ERBAC的动态授权管理框架，最后用形式化语言描述了ERBAC模型满足的规则。

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