Through　the　comparative　study　of　solar　capillary　low-temperature　hot　water　radiant　heating　system　with　air　source　heat　pump　system　has　found　that　solar　energy　heat　collecting　efficiency　has　a　great　relationship　with　the　collector　temperature　for　the　given　system.　To　reduce　the　temperature　of　solar　heat　collector　circulating　water　can　greatly　improve　the　heat　collecting　efficiency　of　the　heat　collector.With　the　increase　of　temperature　of　the　water　in　the　heat　collector,　heat　collecting　efficiency　decrease　rate　changes　linearly.　Increasing　water　storage　can　improve　the　heat　collecting　efficiency,　for　this　heat　collecting　system,　the　optimum　collector　temperature　is　32　°C.　In　this　study,　COP　reached　5　when　the　low　temperature　solar　hot　water　capillary　system　mode　is　being　used,　and　this　result　is　nearly　5　times　higher　than　that　of　the　air　source　heat　pump　mode.　Using　the　low　temperature　solar　water　heating　capillary　system,　27.35　kwh/(m2　·heating　season)　of　electricity　can　be　saved　compared　with　the　amount　of　electricity　consumed　by　air　source　heat　pump.　According　to　the　price　of　current　Beijing　city,　the　estimated　period　of　investment　payback　is　4.8　years.　©　(2014)　Trans　Tech　Publications,　Switzerland.