A　novel　solar　PV/T-air　dual　heat　source　composite　heat　pump　system　was　developed　and　the　experimental　platform　was　built　to　research　the　instantaneous　performance.　The　experimental　results　show　that　the　maximum　instantaneous　generating　efficiency　of　solar　PV/T　collecting　circulation　of　the　system　could　achieve　15.0%　and　average　heat　collecting　efficiency　was　43.8%　when　average　ambient　temperature　and　solar　irradiance　were　6.5　degrees　C　and　581.5W/m(2).　Heat　distribution　average　ratio　of　solar,　air　and　compressor　at　the　run　time　were　28.1%,　35.7%　and　36.2%　respectively.　Heat　pump　instantaneous　COP　changed　between　2.0　to　2.6　and　the　average　value　was　2.5,　which　indicated　that　the　system　performance　was　relatively　well.　(C)　2015　Published　by　Elsevier　Ltd.