China　is　actively　promoting　ocean　territory　construction,　and　how　to　design　low-energy　buildings　to　fit　the　unique　climate　of　tropical　island　regions　has　received　much　attention.　The　heat　transfer　coefficient　of　a　building　external　surface　plays　a　vital　role　in　calculating　air-conditioning　load　accurately.　To　obtain　reasonable　heat　transfer　coefficients　in　the　tropical　island　region,　this　study　introduced　a　naphthalene　sublimation　experiment　to　conduct　full-scale　measurements　on　convective　heat　transfer　coefficients　(CHTCs)　in　the　tropical　island　region,　and　proposed　a　simplified　calculation　model　of　evaporative　heat　transfer　coefficients　(EHTCs).　Results　indicated　that　the　function　expression　between　CHTC　and　wind　speed　was　CHTC　=　5.56　+　4.48u　(R-2　=　0.94),　and　it　was　validated　to　be　reliable.　Furthermore,　compared　with　CHTCs　and　radiation　heat　transfer　coefficients　(RHTCs),　the　EHTC　had　a　wider　changing　range,　owing　to　rainfall　effects.　Moreover,　whether　evaporation　was　considered　or　not,　the　difference　of　total　heat　transfer　coefficients　(THTCs)　on　building　external　surfaces　was　5.2　W/(m(2)K)　for　the　whole　year,　so　evaporation　cannot　be　ignored　directly.　Additionally,　THTCs　with　consideration　of　evaporation　in　winter　and　summer　were　33.4　W/(m(2)K)　and　38.9　W/(m(2)K)　severally,　which　are　much　larger　than　the　recommended　values　in　the　Chinese　standard.　This　study　would　make　up　for　the　lack　of　surface　heat　transfer　coefficients　in　energy　conservation　design　of　tropical　island　buildings.