For　variable　speed　(VS)　space　heating　air　source　heat　pump　(ASHP)　unit,　its　different　operation　speed　combi-nations　may　significantly　affect　the　frosting　suppression　and　heating　performances.　However,　currently　there　is　no　frosting　suppression　operation　method　for　VS　ASHP　units,　so　that　their　frosting　suppression　ability　using　different　speed　combinations　is　not　fully　utilized.　Therefore,　a　novel　frosting　suppression　operation　method　based　on　the　frosting　suppression　performance　map　for　VS　ASHPs　has　been　proposed,　and　its　development　through　experimental　is　reported　in　this　paper.　Firstly,　a　novel　operation　method　to　guide　the　frosting　suppression　operation　for　VS　ASHPs　is　proposed.　Secondly,　an　experimental　setup　with　two　VS　experimental　ASHP　units,　test　conditions,　and　nine　study　cases　are　described.　Thirdly,　the　speed　combinations　that　led　to　different　frosting　suppression　potentials　but　with　the　same　output　heating　capacity　were　determined　using　the　developed　frosting　suppression　performance　map,　and　comparative　tests　were　carried　out.　It　is　shown　that　the　use　of　the　proposed　novel　frosting　suppression　operation　method　with　the　optimal　coefficient　of　performance　(COP),　which　can　in-crease　the　total　output　heating　capacity　(Q)　by　15%　and　the　COP　by　25%.　The　proposed　novel　operation　method　was　straightforward　and　simple　to　implement,　which　could　contribute　to　the　further　development　of　frosting　suppression　operation　for　ASHPs.