Method for optimal placement of unpopular resource indexes in peer-to-peer network

The invention relates to a method for optimal placement of unpopular resource indexes in a peer-to-peer network. According to the method, mathematical abstraction is performed on node selection of buffer indexes and balanced placement of the indexes in the peer-to-peer network, and a model for resource optimal placement is provided in a mathematical angle, so that the success rate of searching unpopular files in the peer-to-peer network is improved, the expenditure of the buffer indexes is lowered, and the total expenditure of the whole network is lowered to make the network have higher extensibility.