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Routing performance is critical for peer-to-peer (P2P) systems to achieve high performance. Current routing algorithms concentrate on creating a well organized network architecture to boost routing performance. However, for each routing procedure, system returns location information of the requested file only and the characteristics of system workload are seldom considered. We propose the UCP2P routing algorithm which introduce "superobject" to take advantage of spatial locality among file accesses. When a client retrieves a file, UCP2P routing algorithm may send location information of several other correlated files in addition within one routing procedure. No further routing procedure is needed if the client requests any of these files later. By this mechanism, we can greatly reduce the routing overhead. Our preliminary simulation results show UCP2P achieves a great routing performance improvement over the previous algorithms.