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In recent years, P2P network is one of hot research fields. Related works of P2P mainly focus on file-sharing application. It only supports the retrieval of the query based on keywords, and is lack of support for semantic search. In this paper, a P2P-based semantic retrieval system is presented. By using distributed inverted index based semantic network, retrieval is based on ontology located at different nodes rather than keywords. The experiments show that P2P-based semantic retrieval system has higher performance compared with retrieval based on keywords.