In order to improve the performance of air source heat pump and better meet the special technical requirements of wellhead antifreeze, an air source split heat pipe heat pump heating system experimental platform was built by coupling air source heat pumps with heat pipe technology and using a small pressure ratio heat pump unit. In this coupled system, phase change heat transfer is adopted at both ends of the evaporator and condenser, and their performance characteristics under different opera-ting conditions are studied. The results show that even under outdoor conditions around 0 ℃, the Coe-fficient of Performance (COP) can still reach 4.5 or above, far superior to traditional air source heat pump units.