In　the　light　of　low　efficiency　of　photovoltaic　power　generation　and　the　problems　of　air　source　heat　pump　applied　in　cold　regions,　a　composite　heat　exchanger　evaporator　is　developed　and　a　new　type　of　solar-air　composite　heat　source　heat　pump　hot　water　system　is　designed　in　this　study,　which　is　comprised　of　independent　solar　photovoltaic-thermal　collector　based　on　flat　plate　micro　heat　pipe　and　air　source　heat　pump.　The　performance　of　heat　pump　hot　water　system　is　evaluated　experimentally　under　different　operating　conditions,　including　water　temperature　of　the　tank,　heating　time　of　hot　water,　suction　and　discharge　pressure,　consumption　of　compressor　power　and　heat　pump　coefficient　of　performance　(COP),　etc.　Experimental　results　show　that　at　ambient　temperature　of　5°C,　10°C　and　15°C,　with　73　L　hot　water　heated　by　heat　pump　and　water　temperature　in　the　tank　ranged　from　15°C　to　50°C,　the　running　time　of　composite　heat　source　operation　is　shorter　than　that　of　separate　air　heat　source　operation,　decreased　by　5.14%,　10.29%　and　11.38%,　respectively.　COPs　are　increased　by　5.99%,　9.28%　and　11.96%,　respectively.　©　All　Rights　Reserved.