The　resource　query　mechanism　is　mostly　based　on　keywords　in　most　P2P　systems　at　present.　It　limits　resources　sharing　to　some　extent.　Along　with　the　emergency　of　semantic　web　technology,　sharing　resource　at　the　semantic　level　in　P2P　system　becomes　a　new　hot　topic.　Based　on　ontology　technology,　the　integrated　model　and　the　heterogeneous　resources　integration　approach　in　a　P2P　system　are　studied　in　this　paper.　The　mapping　rules　from　multi-resources　to　ontology　and　the　semantic　mapping　rules　between　different　kinds　of　ontologies　are　defined.　A　general　model　for　sharing　resources　in　P2P　systems　based　on　semantic　technologies　is　designed.　The　model　structures　of　system　and　peer　are　described.　A　method　for　measuring　the　semantic　similarity　between　peers　is　designed　and　query　processing　is　illustrated.