In　this　study,　the　performance　of　a　novel　photovoltaic/thermal　(PV/T)　air　dual-heat-source　composite　heat　pump　hot　water　system　was　investigated　experimentally　and　analyzed　theoretically.　First,　a　system　that　simulates　a　solar　PV/T　collector　by　electric　heating　was　built　and　tested　to　validate　the　superiority　of　the　hot　water　system.　The　system　was　divided　into　dual-heat-source　operating　mode　and　single-heat-source　operating　mode.　Results　showed　that　the　average　COP　and　COPsys　for　dual-heat-source　operating　mode　were　2.49　and　2.24,　respectively,　and　for　single-heat-source　operating　mode　were　1.40　and　1.31,　respectively,　which　indicate　that　the　former　had　better　system　performance.　Then,　the　actual　PV/T　collector　was　used　in　the　system.　The　results　showed　that　the　average　electrical　gain　and　heat　gain　were　278W　and　664W,　respectively.　The　average　electrical　efficiency　and　heat　efficiency　were　14.5%　and　36.02%,　respectively.　Meanwhile,　the　comprehensive　efficiency　was　more　than　50%.　The　average　COP　and　COPsys　of　the　heat　pump　were　4.08　and　3.07,　respectively,　along　with　the　system　exergy　efficiency　of　0.33.　Therefore,　the　PV/T　air　dual-heat-source　composite　heat　pump　hot　water　system　has　excellent　performance　and　is　worth　promoting　and　applying.　(C)　2015　Elsevier　B.V.　All　rights　reserved.