During"Triple play"is put into practice

lots of users are will to choose the network video service.More and more users’ requests would not be available on the edge nodes of content distribution network.In order to reduce the impact to network

a thought about constructing internal assisting domain in the content distribution network was put forward in this paper.Based on the P2P and triangular transmission technology

the users’ requests can be redirected from the nearest edge node to the appropriate one in the assisting domain.At the same time

the load balance problem was completely solved by content slicing technology.