As　active　promotion　of　the　construction　of　3　million　square　kilometers　ocean　territory　in　China,　the　design　of　ultra-low-energy　buildings　in　ocean　areas　has　attracted　more　and　more　researchers＇　attention.　To　investigate　the　scientific　accuracy　of　climate　partition　in　ocean　areas,　the　article　firstly　analyzed　the　climatic　characteristics　in　ocean　areas　from　two　different　angles-climate　comparisons　between　sea　and　land,　as　well　as　among　different　sea　regions,　and　then　determined　the　climate　partition　of　inland　cities　and　island　counties　(or　ocean　island-reefs)　according　to　current　climate　zoning　standards.　The　results　presented　the　wide　differences　between　sea　and　land,　which　were　reflected　in　the　aspects　of　CDD26,　daily　temperature　range　and　wind　speed.　The　diversities　for　CDD26,　annual　temperature　range　and　solar　radiation　vary　in　different　sea　regions.　Additionally,　building　climate　partition　standard　performed　by　our　countries　now　is　inapplicable　for　ocean　areas.　Therefore,　it＇s　necessary　to　establish　building　climate　partition　for　ocean　areas　which　is　distinguished　from　the　inland　areas,　and　the　south　sea　region　is　more　complex　than　north　or　east　sea　regions.　This　study　can　prompt　ocean　areas　to　form　scientific　climate　partition,　and　lay　a　theoretical　foundation　for　the　indoor　thermal　comfort　research　and　the　design　of　ultra-low-energy　buildings　in　ocean　areas.　©　2018,　Editorial　Board　of　Journal　of　Harbin　Institute　of　Technology.　All　right　reserved.