Access control has important significance in the information platform. This paper has further studied model of RBAC, through the analysis of office business and reference the theory of finely granular access control, and put for-ward a kind model of super fine grained based on RBAC which makes the role management more convenient and quick. In the model,it makes the roles associated with the units and departments,that make questions which the same roles in different units and departments have permission to access different resources has been resolved.%访问控制是保护系统安全的重要防护之一，对RBAC方法进行深入研究，通过对办公业务的分析与借鉴细粒度访问控制方法的思想，提出一种基于角色的超细粒度权限模型（SFG-RBAC），使角色管理更加方便快捷。在该模型中把角色与单位、部门联系在一起，使具有相同角色的不同的单位、部门访问不同资源的权限问题得到解决。
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