In　this　study,　a　multi-function　solar　photovoltaic/thermal　(PV/T)-heat　pump　system　was　designed　and　established　to　supply　energy　for　residential　buildings.　The　system　could　realize　different　functions　by　operating　in　different　modes,　such　as　heating　in　winter,　cooling　in　summer,　domestic　water　heating　for　a　whole　year,　and　part　of　household　electricity　demand.　System　performance　was　experimentally　investigated.　Results　showed　that　the　average　overall　efficiency　of　PV/T　collector　was　more　than　50%　for　PV/T　water　heating　mode　when　solar　irradiance　was　sufficient,　thereby　indicating　the　good　performance　of　the　PV/T　collector.　Under　experimental　conditions,　the　coefficients　of　performance　(COPs)　of　PV/T-WSHP　heating　mode　and　PV/T-W&ASHP　heating　mode　were　3.18　and　2.53,　which　were　much　higher　than　the　COP　of　ASHP　heating　mode　with　2.23.　The　difference　was　attributed　to　that　the　addition　of　solar　energy　could　improve　evaporating　temperature　of　heat　pump　system.　Therefore,　different　operating　modes　could　be　activated,　thereby　realizing　the　maximum　possible　energy　conservation.　In　conclusion,　the　system　could　fully　utilize　solar　energy　and　realize　advantageous　complementarities　between　solar　energy　and　heat　pump　by　cascade　energy　utilization.　The　data　and　analysis　could　provide　a　reference　for　the　combination　form　between　solar　PV/T　system　and　different　heat　pump　systems.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.