This paper presents a MANET routing model based on chord, expands P2P distributed share strategy into MANET Routing. By using the new model a structured P2P network overlay is formed on MANET physical network, the Chord algorithm is combined with DSR protocol, thus the storage and computational resources of free nodes are exploited fully to speed up the routing process, which makes nodes acquire more available routing information. The experiment proves that the use of this model can availably increase the large-scale MANET routing efficiency, which lays the foundations for exploiting the efficient and available MANET routing protocols.