When　assessing　explosion　risks　of　super-large　offshore　structures　such　as　Floating　Liquefied　Natural　Gas　(FLNG)　facilities,　there　are　neither　design　rules　nor　industry　standards　available　as　FLNG　is　a　new　technology.　Meanwhile,　a　large　amount　of　Computational　Fluid　Dynamic　(CFD)　calculation　time　is　required　due　to　its　super-large　size　and　highly　complicated　topside　structures.　A　multi-level　explosion　risk　analysis　method　(MLERA)　is　developed　in　this　paper,　which　divides　the　whole　structure　into　subsections　and　applies　detailed　CFD　calculations　only　to　the　areas　with　the　highest　level　of　potential　risks　so　that　the　computational　time　can　be　reduced　to　a　realistic　and　acceptable　level.　The　MLERA　includes　three　levels,　which　are　qualitative　risk　screening,　semi-quantitative　risk　classification,　and　quantitative　risk　assessment.　A　CFD　tool　called　FLACS　is　used　as　a　calculation　tool　for　detailed　risk　quantification,　and　an　ALARP　(as　low　as　reasonably　practical)　method　is　selected　as　a　calibration　tool　and　used　to　determine　the　acceptance　of　the　explosion　risk.　Meanwhile,　since　the　current　design　standards　for　normal　offshore　platforms　are　not　sufficient　for　super-large　structures,　during　the　risk　screening　and　risk　classification　processes,　safety　barriers　are　used　as　extra　risk　indicators　in　addition　to　the　traditional　ones.　A　case　study　is　conducted　based　on　a　cylindrical　FLNG　model,　and　the　result　of　the　case　study　proves　that　the　proposed　MLERA　method　is　able　to　save　a　large　amount　of　computational　time.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.