The　P2P　IPTV　has　developed　extremely　fast,　but　it　also　has　brought　inevitable　problems:　underpass　for　illegal　video　spread　and　etc.　Supervision　and　management　of　P2P　IPTV　is　called　by　the　governments.　However　most　of　P2P　IPTV　applications　are　closed　source　and　the　p2p　network　has　the　features　of　decentralization　and　anonymity,　making　analysis　and　measurement　inconceivably　difficult.　This　paper　declared　an　approach　of　how　to　identified　packets　which　contains　node　list　though　the　protocol　is　closed　source　by　using　packet　signature　analysis.　The　results　of　measuring　some　typical　P2P　IPTV　applications　approved　feasibility　of　the　approach.　It　could　be　a　reference　for　any　research　of　P2P　IPTV　node　measurement.