This　article　is　to　study　the　similarities　and　differences　in　terms　of　computational　methodologies　in　different　nations,　as　well　as　to　analyze　the　accuracy　and　reliability　of　them,　and　consequently　to　raise　proposals　to　improve　this　methodology　in　China.　The　author　chose　an　atrium-style　metro　station　as　a　study　case.　Computations　and　comparisons　were　carried　out　on　the　evacuation　time,　according　to　the　terms　in　Chinese　＂CFDOM＂　(GB50157-2013),　the　U.S.　＂NPFA130＂　(2014)　and　Japanese　＂JIS　Railway　Standards＂.　The　results　indicate　that,　the　computational　methodology　in　China　is　readily　to　be　comprehended,　while　it　ignores　some　important　features.　A　certain　extent　of　irrationality　can　be　found　in　this　methodology.　While　the　American　and　Japanese　codes　specify　the　evacuation　path　in　details,　which　leads　to　a　more　reasonable　evacuation　time.　Therefore,　in　practical　use,　a　synthetic　methodology　that　considers　multinational　codes　is　commonly　suggested,　for　the　most　precise　evacuation　time.　(C)　2016　The　Authors.　Published　by　Elsevier　Ltd.