Abstract: P2P network is widely used in IPTV systems now．The essence of P2P streaming is making use of the upload bandwidth of each peer to reduce the load of the streaming servers．Regard to VOD P2P network,most of the existing researches are focused on peer selection strategies,such as the peer topology,peer bandwidth contribution,balance of peer churn and stream quality．These researches do make a significant improvement to the P2P live streaming and the P2P VOD systems．In this paper,we designed a new content-oriented buffering mechanism for P2P VOD on embedded system．It can minimize the weakness of embedded system (few memory and storage),and make an intelligent buffer mechanism at the basis of content popularity．Using this new mechanism,P2P VOD system can get a lower built-up time and a higher data sharing rate.

Key words: P2P VOD system,Content-oriented,Dynamic buffer,Embedded system