Current cloud service has high reliability, high storage capacity and processing ability. However, in VOD system, temporal locality of nodes and other networked applications lead that user's mutual share mechanism has not satisfied user's requirement on VOD. Therefore, this paper integrates cloud calculation with P2P framework to propose a mixed architecture combining these two aspects and implement cloud service advantages to assist P2P service. Then, this paper mainly analyzes selection strategy of current server. It adds user's uploading ability and server memory to be modeling in P2P mode. By simulated experiments, this paper verifies the effectiveness of proposed method and it further concludes and formulates the definite object for next task.
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