In　this　study,　experiment　study　on　characteristic　of　radiant　ceiling　cooling　system　combined　with　fresh-air　cooling　system　was　carried　out　in　Nanjing　of　China.　Mainly,　the　influences　of　supply　parameter　on　cooling　capacity　of　the　capillary　tube　system　were　analyzed,　at　meantime,　the　experimental　results　showed　that　the　flow　rate　of　fresh-air　which　meet　the　heath　standard　could　well　control　the　indoor　humidity.　The　fitting　curve　of　cooling　capacity　was　achieved　which　provides　the　technical　support　for　the　design　and　operation.　©　2011　IEEE.