This　paper　studies　the　heating　energy　efficiency　and　optimization　of　a　solar-air　source　heat　pump　(SASHP).　Through　system　simulation,　the　energy　efficiency　of　the　SASHP　is　compared　with　other　heating　methods.　The　results　show　that　SASHP　has　higher　energy　efficiency.　We　also　found　that　in　the　SASHP,　the　air　source　heat　pump　(ASHP)　is　involved　in　heating　46%　of　the　time.　Therefore,　we　suggest　optimizing　the　energy　consumption　of　the　ASHP　to　improve　the　system＇s　energy　efficiency.　In　addition,　lowering　the　supply　water　temperature　can　also　reduce　the　system＇s　heating　energy　consumption.　When　the　supply　water　temperature　is　lowered　from　60°C　to　48°C,　the　COP　is　increased　from　1.98　to　2.83,　which　is　a　31%　improvement.　Our　research　provides　theoretical　support　for　the　application　of　SASHP　and　provides　new　ideas　for　achieving　green　and　low-carbon　heating.　　©　Published　under　licence　by　IOP　Publishing　Ltd.