In　practical　engineering　application　of　radiant　floor　cooling　system,　both　floor　surface　temperature　and　the　lowest　temperature　in　surface　are　more　concerned　because　the　former　determine　cooling　capacity　and　indoor　thermal　comfort　and　the　later　is　a　key　parameter　for　preventing　condensation　in　floor　surface　based　on　consideration　of　the　dew　point　in　the　indoor　environment.　In　this　paper,　a　simplified　thermal　calculation　method　for　multilayer　floor　structure　in　radiant　floor　cooling　system　is　proposed.　Based　on　the　analysis　of　heat　transfer　process　of　floor,　the　equivalent　thermal　resistance　method　is　developed　and　some　formulas　are　derived　to　estimate　floor　surface　temperature　distribution.　The　simplified　calculation　method　is　validated　by　experiments.　The　absolute　error　between　simplified　calculation　and　experiment　results　of　floor　surface　temperature　is　within　0.4　degrees　C.　By　this　proposed　method,　it　is　helpful　to　easily　estimate　floor　surface　temperature　distribution　and　analyze　the　influence　of　parameters　of　floor　structure　on　thermal　characteristic　of　floor.　(C)　2014　Elsevier　B.V.　All　rights　reserved.