Targeted at problems of role distribution aberration, role switching inheritance aberration, etc, existing within inter-domain role switching in interoperable role-based access control (IRBAC) modal, this article has proposed inter-domain interface role and inter-operation manager role, the inter-domain interface role includes internal role and external role, the inter-operation manager role handles the management of inheritance between internal role and external role, and this solution can effectively avoid drawbacks existing within inter-domain role switching. This article has also proposed an improved multi-domain authorization management modal, which can effectively solve the problem of cross-domain authorization and authentication of (IRBAC) modal under multi-domain environment and thus guarantee the security of cross-domain access.