As the role administration of authorization in large system is complex

a temporal role-based administration of authorization model is proposed in this paper.Consider that the user permission usually includes private permission

department permission and public permission

and the permission need update frequently

so the model expands the definition of permissions by adding a parameter of permission transmitting depth

i.e.the number that the permission can be inherited

which corresponds to the number of posts and the kind of permission in reality.And further

the model adds temporal constraint in permissions inheritance

i.e.only the permissions owned by the role that meets time requirement can be inherited.The model not only benefits from permissions update frequently

but also corresponding to the number of posts in reality

and it is easy to understand and operate.