The　island-reef　areas　located　in　southern　China　have　a　unique　climate　high　temperature,　high　humidity,　high　concentrations　of　salt　mist,　strong　solar　radiation,　small　diumaliannuaLtemperature　range　and　perennial　sea　breeze,　and　it　is　exceedingly　diverse　with　the　climate　in　Chinese　inland.　In　order　to　prove　the　simple　naphthalene　sublimation　method　for　measuring　convective　heat　transfer　coefficient　(CHTC)　is　feasible　in　extreme　climate　conditions　and　obtain　CHTC　recommended　value　in　island-reef　areas,　the　study　adopted　the　research　methods　to　combine　field　measurement　and　data　statistics.　According　to　taking　the　measured　data　from　naphthalene　sublimation　experiment　as　strong　support,　predictive　formula　of　CHTC　on　vertical　external　surface　of　island-reef　building　under　low　wind　velocities　was　raised　to　provide　convenience　for　engineering　design　and　validated　feasible　by　comparing　with　ASHRAE　recommend　formula　based　on　error　analysis.　Subsequently,　the　CHTC　predictive　formula　and　the　specific　wind　characteristics　in　Xisha　Islands　of　China　were　analyzed　together.　The　results　showed　that　CHTCs　had　a　wide　range　from　6.22　W/m(2).Kto　54.66　W/m(2).K,　and　the　average　CHTC　of　all　measured　points　was　17.30　W/m(2).K.　Additionally,　CHTCs　on　windward　were　greater　than　those　on　leeward.　Furthermore,　the　CHTC　predictive　formula　under　low　wind　velocities　raised　by　this　study　was　precise　and　reliable,　and　could　guarantee　to　be　applicable　for　island-reef　building　more　than　55%　time　no　matter　which　season　it　was.　Consequently,　CHTC　on　vertical　external　surface　of　island-reef　building　under　low　wind　velocities　was　recommended　as　21.51　W/m(2).K　in　terms　of　average　level　of　the　whole　year.　This　study　can　provide　convenience　for　popularizing　the　simplified　method　in　extreme　climate　conditions　and　lay　a　solid　foundation　for　the　design　of　low　energy　consumption　building　in　island-reef　areas.(C)　2017　Elsevier　B.V.　All　rights　reserved.