Abstract: File sharing is one of the important application based on P2P, and how to improve the fast transmission based on P2P is important technology which is the guarantee of users' satisfaction. Based on the previous studies, this paper put forward a data fragment and fair storage strategy, then gave a parallel transmission algorithm. hhis stored strategy has more great space advantage than the entity copy. And this algorithm not only can adapt to the dynamic changes of the network, but also increase data transmission rate. The experiment result in dicates that it is in accordance with the theory and has a strong suitability and practical application value than previous model.

Key words: P2P(Peer to Peer) , Parallel data transmission, Storage model