Abstract Scholars around the world have carried out extensive research word on architecture, protocols, algorithms and application for trusted network at present, and proposed a variety of network credible verification scheme and control mechanisms. In this paper, a kind of grade division policy for trusted network was provided on the basis of considering both the terminal security and profit of operators. Credible access architecture and certification model were given, and the partition rules of trusted attributes as well as the evaluate methods of grade division were explained in detail. Improved workflow for access to trusted network terminal was provided. Simulations results show that by the proposed framework, not only the safety and reliability of network can be ensured, but also the flexibility of ways to access network was strengthened, and that it can provide support for interoperability of different equipment manufacturers.