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In order to assess the security of network information system, many graph-based approaches have been proposed. Attack Graph is the most influential one. But attack graphs grow exponentially with the size of the network. In this paper, we propose an improved access graph based model to analyze network security. As a complement to the attack graph approach, the access graph is host-centric approach, which grows polynomially with the number of hosts and so has the benefit of being computationally feasible on large networks. Compared with the related works, our approach improves in both performance and computational cost.