HFC32,　of　which　ozone　depletion　potential　(ODP)　is　zero　and　global　warming　potential　(GWP)　is　675,　could　be　an　acceptable　working　fluid　for　heat　pump　to　replace　HFCs.　In　order　to　investigate　the　heating　performance　of　quasi-two　stage　compression　HFC32　heat　pump　system　(QTSC　system),　an　experimental　setup　was　established.　The　results　showed　that　the　discharge　temperature　of　the　QTSC　system　was　10　similar　to　20　K　lower　than　the　single　stage　compression　system　(SING　system),　not　exceeding　the　limit　of　130　degrees　C,　and　the　heat　pump　can　steadily　run　for　long　time　under　condensing　temperature　of　40　degrees　C,　evaporating　temperature　varying　from　-10　to　-5　degrees　C.　The　heating　capacity　of　the　QTSC　system　with　HFC32　is　12　%　higher　than　SING　system,　and　the　heating　COP　depending　on　the　intermediate　vapor　pressure　is　higher　or　lower　than　SING　system.