Solar　energy-soil　source　dual　heat　source　heat　pump　heating　and　air　conditioning　system　is　a　kind　of　energy-saving　and　environmental　protection　system.　Heat　transfer　performance　of　buried　tube　heat　exchanger　and　the　reasonable　design　research　is　necessary　for　the　core　components　of　double　source　heat　pump　system.　This　paper　expounds　the　design　features　of　each　part　and　the　influence　of　factors　of　the　geothermal　buried　tubeheat　exchanger.　Heat　transfer　mathematical　model　is　established　and　gives　the　design　method,　At　the　same　time,　the　example　of　design　calculation　is　given　and　compared　with　operation　data　and　the　analysis.　The　results　show　that　the　geothermal　buried　tube　heat　exchanger　design　is　reasonable　in　this　paper,　the　design　data　tallies　well　with　the　operation　data,　the　calculation　is　simple　and　conform　to　the　practical　operation　requirements.