As　the　conventional　dehumidification　process　in　an　air　conditioner　is　by　subcooling　the　air,　the　supply　air　is　insufficient　to　meet　the　indoor　comfort　needs　under　a　mild　and　humid　operating　condition.　This　paper　proposed　an　air　conditioner　with　reheating　coil　and　studied　its　working　performance　for　varied　compressor　frequencies　under　different　temperature　and　humidity　conditions,　including　the　supply　air　parameters　and　dehumidifying　characteristics.　As　the　results　shown,　the　air　conditioner　with　reheating　coil　worked　steadily　under　air　conditioning　mode　and　two　dehumidification　modes.　Other　than　conditioning　the　temperature　only,　it　can　also　regulate　the　temperature　with　dehumidification.　The　largest　temperature　rise　in　the　supply　air　was　8.45　degrees　C　compared　with　the　inlet　air,　and　the　relative　humidity　was　lowered　by　51.88%,　which　indicated　that　the　air　conditioner　with　reheating　coil　worked　sufficient　under　cold　and　humid　or　mild　and　humid　weather.　The　specific　moisture　extraction　rate　increased　with　the　rise　of　the　inlet　air　temperature　and　relative　humidity,　but　decreased　along　with　the　increase　of　compressor　frequency.　The　maximum　value　of　the　specific　moisture　extraction　rate　reached　10.07　kg/kWh.