Abstract: In this paper we propose a structured Peer-to-Peer Search, mDOS （multi-Dimensional Overlays based Search） . mDOS simulates the Small World model in the social network, arranging the peers in multi-demensional tree structures according to peers＇ multi-attr

Key words: Structured Peer-to-Peer, Small world, Multi-demensional overlay, Semantic distance, Sense of routing orientation