A　new　system　based　on　solar　photovoltaic/thermal-ground　source　heat　pump　(PV/T-GSHP)　was　proposed　to　solve　the　problems　of　energy　shortage　and　high　energy-consuming　buildings　in　China.　The　operation　performance　of　the　PV/T-GSHP　system　in　a　demonstration　project　in　Dalian　of　China　was　studied　and　energy　saving　performance　was　analyzed.　The　results　show　that　this　PV/T-GSHP　system　can　reduce　the　temperature　of　photovoltaic/thermal　modules　as　high　as　10.,　and　improve　the　efficiency　of　electricity　production　by　25%,　simultaneously.　And　in　heating　season　the　average　COP　of　the　heat　pump　remains　around　3.　Then　the　model　of　the　PV/T-GSHP　system　was　established　based　on　the　Polysun　software,　the　system　parameters　were　optimized,　followed　by　analyzing　the　technical　and　economic　of　the　project.　The　optimization　data　and　energy　saving　effect　of　this　demonstration　system　can　provide　guidance　for　future　related　project.　(c)　2017　The　Authors.　Published　by　Elsevier　Ltd.