The　cooling　characteristics　of　a　radiant　floor　cooling　system　with　the　embedded　pipes　for　an　office　building　in　Beijing　had　been　researched　mainly　by　experiments　in　this　paper.　The　indoor　air　and　floor　temperature　changed　with　supply　water　and　outdoor　temperature　were　tested　and　analyzed.　The　experimental　results　show　that:　1)　temperature　of　supply　water　plays　a　more　important　role　on　the　characteristics　of　a　radiant　floor　cooling　system　than　water　velocity　and　shall　be　controlled　above　17°C　to　prevent　condensation　on　the　floor　surface,　2)　when　the　radiant　floor　cooling　system　is　adopted,　indoor　mean　radiant　temperature　and　operative　temperature　are　lower　than　air　temperature　respectively.　3)The　vertical　air　temperature　difference　is　about　2.1∼4.1°Cat　the　height　of　0.1m　to　1.1m　above　the　floor　and　meets　the　related　standard　during　95%　of　24　hours　in　a　day.　©　2011　IEEE.