This　paper　focuses　on　the　research　on　patents　of　proton　exchange　membrane　fuel　cell　(PEMFC).　It　uses　the　method　of　Social　Network　Analysis　(SNA)　to　analyze　the　core　patent　and　assignees　of　GM　and　Panasonic.　Therefore,　we　can　obtain　the　core　patent,　future　trends　of　technology　and　other　important　information.　This　paper　aims　to　provide　reference　information　for　the　enterprise　to　understand　the　industry　dynamics　and　make　development　plan　in　technology.　©　2010　IEEE.