With　each　passing　day　of　enterprise　business,　work　flow　needs　to　be　improved　frequently,　which　proposes　high　requirements　to　the　process　definition　tool.　Through　briefly　introducing　the　concept　of　workflow　and　workflow　management　system,　the　foundational　and　importance　of　process　definition　has　been　pointed　out　in　the　workflow　management　system.　Finally,　giving　the　Design　and　Implementation　of　Process　Definition　Tool.　©　2010　IEEE.