Air　source　heat　pump　(ASHP)　has　advantages　of　high　efficiency,　eco-friendly　operation,　and　convenient　installation,　but　frost　accumulation　on　the　outdoor　heat　exchanger　is　one　of　the　basic　concerns　about　its　operation.　Reverse　cycle　defrosting　(RCD)　is　widely　used　for　defrosting,　however,　when　RCD　begins　and　ends,　the　four-way　reversing　valve　quickly　switches　and　the　system　pressure　needs　to　be　rebalanced　which　will　cause　the　incomplete　evaporation　of　refrigerant　into　the　compressor.　Thus,　it　leads　to　the　decrease　of　the　performance　of　the　ASHP　system　during　RCD.　In　order　to　improve　the　performance　of　RCD,　this　study　proposes　an　ASHP　defrosting　system　with　coupled　liquid-storage　gas-liquid　separator.　An　obvious　advantage　of　the　proposed　system　is　retarding　frosting,　reducing　defrosting　time　and　increasing　the　heating　capacity　and　coefficient　of　performance　(COP)　of　the　ASHP　system　thus　reducing　the　number　of　defrosting　cycles.　And　the　proposed　system　can　improve　indoor　thermal　comfort　during　defrosting.　Experiments　show　that　compared　with　the　original　system,　the　proposed　system　delays　frosting　by　30　min　and　reduces　the　defrosting　time　by　74　s　(22.7%),　improving　the　heating　capacity　and　COP　by　6.78%　and　12.8%　respectively.　Moreover,　the　proposed　system　with　the　coupled　liquid-storage　gas-liquid　separator　is　economically　friendly,　which　further　benefits　its　practical　applications.　©　2021