How　much　service　performance　of　searching　and　transmitting　is　provided　by　P2P　network　for　a　concrete　resource?　How　much　success　ratio　and　recall　ratio　of　resource＇s　searching　of　existing　P2P　network　is?　Rare　research　is　deepened　about　those　questions.　This　paper,　for　unstructured　P2P　network,　construct　P2P　network　queuing　model,　provide　calculating　method　of　service　performance　of　concrete　resource,　analyze　success　ratio　and　recall　ratio　of　resource＇s　searching,　by　experiment　simulation,　discuss　the　influence　of　resource＇s　popularity,　Peer＇s　quantity,　initial　number　of　objected　resource,　Peer＇s　average　degree　and　TTL　value　of　protocol　to　the　searching　result　of　concrete　resource.　We　conclude,　during　the　resource　searching　process,　the　number　of　searching　result　linearly　increases　with　initial　number　of　objected　resource,　and　exponentially　increases　with　Peer＇s　average　degree　and　TTL　value,　but　decreases　nonlinearly　with　Peer＇s　quantity.　©　2008　IEEE.