To　promote　energy-saving　potentials　of　the　energy　recovery　unit　under　all-year　conditions,　a　composite　system　combining　pump-driven　loop　heat　pipe　with　heat　pump　was　firstly　proposed,　and　the　mathematical　models　were　established.　The　operating　characteristics　of　the　composite　system　were　studied　in　the　whole　year　and　compared　with　the　traditional　heat　pump　heat　recovery　system.　The　results　show　that　the　heating　capacity　of　the　composite　system　is　in　line　with　the　heating　load　in　winter.　Compared　with　the　traditional　heat　pump　system,　the　composite　system　has　higher　energy　efficiency　ratio　and　lower　deviation　degree　of　temperature　effectiveness　in　the　whole　year.　The　heat　pump　composite　pump-driven　loop　heat　pipe　heat　recovery　system　is　generally　superior　to　similar　system　reported　in　literatures,　which　indicates　that　it　can　replace　heat　pump　system　in　buildings　ventilation.