Building a virtual network topology named P2P overlay network on top of Internet’s physical topology layer based on P2P computing mode can lead to the effective building of a full-decentralized internet based self-organizing network routing model—hierarchical aggregation self-organizing network (HASN). The target and architecture of HASN are described in this paper, as well as a detailed description of the P2P decentralized naming, route discovering and updating algorithm-HASN_Scale. Simulation results testify the performance of HASN.