The typical contemporary P2P streaming media system was analysed,and a new P2P streaming system based on autonomous system was proposed.This P2P streaming system takes the loose property of network into account and according to the geographical locations of the peer-to-peer nodes divides the network into different autonomous systems,in which the communication cost will be lower.Some nodes with strong capabilities,called strong nodes,are selected in the autonomous systems to form the relay layer.In the proce...