Global　greenhouse　gas　emission　attracts　significant　attentions　across　varied　communities,　and　carbon　emission　(CE)　reduction　has　become　hot　topic　in　the　maritime　field　considering　that　appropriately　3%　CE　come　from　the　field.　The　prerequisite　for　fulfilling　the　task　is　to　accurately　quantify　the　ship　CE.　To　achieve　the　aim,　the　study　utilizes　indicators,　such　as　carbon　dioxide　(CO2)　emission,　CO2　index,　fuel　consumption,　energy　efficiency　operational　indicator　(EEOI),　fleet　energy　efficiency　management　index　(FEEMI),　to　analyze　ship　energy　consumption.　We　employ　ship　voyage　data　from　container,　oil　tanker,　bulk　carrier　and　liquefied　natural　gas　(LNG)　carrier　to　evaluate　ship　energy　consumption.　We　have　testified　EEOI　variation　tendency　under　different　ship　cargo　loading　volume　states　(i.e.,　full/partial　load)　and　speed　deceleration　scenario.　Moreover,　the　FEEMI　indicator　is　used　to　determine　energy　efficiency　for　different　ship　fleets　(container　ship　fleet,　oil　tanker　fleet,　bulk　carrier　fleet,　LNG　fleet).　Experimental　results　suggest　that　EEOI　is　proportional　to　ship　energy　consumption　when　the　sailing　distance　and　cargo　volume　are　constant.　The　ship　EEOI　indicator　calculated　in　full-loaded　status　is　obviously　smaller　than　the　counterpart　under　partial-load　status.　The　fleet　energy　consumption　efficiency　shows　a　slight　increase　(at　least　1%)　due　to　release　of　ship　energy　efficiency　management　plan.　The　research　findings　can　help　maritime　policy-makers　provide　more　reasonable　regulations　for　the　purpose　of　ship　energy　consumption　enhancement.　©　2024　Elsevier　Ltd