Fault-tolerance　is　an　important　property　of　conference　key　distribution　protocol.　Recently,　Yang　et　al.　proposed　an　identity-based　fault-tolerant　conference　key　distribution　scheme　which　is　much　different　to　the　traditional　ones.　But　their　scheme　can　not　withstand　passive　attack　and　modification　attack,　moreover,　it　also　can　not　provide　forward　security.　An　improved　identity-based　fault-tolerant　conference　key　distribution　scheme　is　proposed　in　this　paper.　Compared　with　the　Yang　et　al.　＇s　scheme,　Tzeng　＇s[1]　scheme　and　Xun＇s　scheme,　the　new　scheme　has　illustrated　the　highest　security　and　its　communication　cost　is　intervenient　Yang　et　al.　＇s　scheme　and　Tzeng＇s[1]　scheme.　As　security　is　the　first-line　property　in　conference　key　establishment　protocol,　our　scheme　is　the　most　practical　one　in　the　mass.　©　2007　IEEE.