In　this　paper,　an　adjustable　coupling　method　is　proposed　to　improve　the　transfer　efficiency　of　magnetically　coupled　resonant　wireless　power　transfer　system　(MCR-WPT)　under　various　transfer　distances.　By　changing　the　offset　distance　between　the　driving　loop　and　the　transmitter　coil,　the　coupling　coefficient　was　adjusted　to　make　the　MCR-WPT　have　a　better　transfer　efficiency　at　various　transfer　distances.　The　efficiency　of　simulation　is　41.1%　higher　than　the　original　MCR-WPT　and　the　experimental　results　are　basically　consistent　with　the　simulation.　©　2021　IEEE.