In　radiant　floor　systems,　the　distribution　of　the　floor　surface　temperature,　which　can　be　used　to　determine　the　mean　temperature　and　the　lowest/highest　temperature　of　the　floor　surface,　is　an　important　parameter.　The　mean　temperature　of　the　floor　surface　determines　cooling/heating　capacity　and　indoor　thermal　comfort.　The　lowest　surface　temperature,　which　considers　the　dew　point　in　an　indoor　environment,　is　a　crucial　factor　in　the　prevention　of　condensation　on　a　floor　surface.　The　highest　surface　temperature　is　typically　considered　for　local　thermal　comfort.　In　this　paper,　an　analytical　solution　for　heat　transfer　in　a　multilayer　floor　structure　of　a　radiant　floor　system　is　proposed　based　on　the　analysis　of　the　heat　transfer　process　of　a　multilayer　floor,　equivalent　thermal　resistance　and　separation　of　variables　method.　The　corresponding　formulas　are　derived　to　estimate　the　distribution　of　floor　surface　temperature.　The　calculation　results　are　validated　by　experiments.　The　calculation　and　experimental　results　show　good　accordance.　The　absolute　error　between　the　calculation　and　experimental　results　for　floor　surface　temperature　is　within　0.3A　degrees　C.　A　method　for　the　calculation　of　the　dimensionless　temperature　of　the　floor　surface,　which　can　be　used　for　radiant　heating　and　cooling　systems,　is　provided.　Using　this　proposed　method,　the　distribution　of　floor　surface　temperature　and　the　influence　of　floor　structure　parameters　on　the　thermal　performance　of　floors　can　be　estimated　and　analyzed.