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