Abstract: A considerable amount of P2P semantic search approaches has been developed. First, the paper introduced a survey schema to review these semantic research approaches from five dimensions,i. e. semantic description method,semantic overlay network structure, query expansion technology, the way of resources clustering and ontology number.Then, the paper compared ten selected typical semantic search approaches by means of the schema. Based on this comparison,we identified and summarized outstanding features of P2P semantic search. Finally, the paper pointed out the necessity to explore new mechanism for resource organization and search,and to focus on a number of open problems,such as P2P semantic search performance evaluation, query expansion technologies improvement and search results ranking.

Key words: Pecr-to-pecr, Semantic search, Query expansion, Semantic description