A　new　analysis　method　which　chooses　the　performance　of　the　irregular　modulation　mapping　schemes　in　bit　interleaved　coded　modulation　with　iterative　decoding(BICM-ID)system　is　proposed　based　on　the　extrinsic　information　transfer　(EXIT)chart,　the　difference　from　EXIT　chart　analysis　method　is　the　proposed　method　utilizes　the　corresponding　relationship　between　the　extrinsic　mutual　information　and　the　whole　signal　to　noise　ratio　region　.　The　simulation　results　show　that　the　proposed　method　can　effectively　choose　the　different　irregular　modulation　mapping　schemes　in　the　different　signal　to　noise　ratio　region　and　can　roughly　evaluate　the　scope　of　system　bit　error　rate　curve　in　BICM-ID　system.