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To analyze the influence of different redundancy access methods on the performance of multi-autonomous networks when the cascading failure occurs, this paper analyzes the topological structure of the multiple autonomous system with different redundancy and establishes the cascading failure model of Multi-AS with different redundancy, according to the actual situation of the Internet and the characteristics of the multiple autonomous system associated with the Internet. Futhermore, the paper analyzes the cascade failure constraints. The results demonstrate that the network with higher redundancy has better network performance when the cascading failures occur. They also show that the increase of packet delivery fraction will enlarge the scale of the cascading failure.