In　this　article,　combining　the　phase　synchronization　method　(PSM)　and　high　harmonic　operation　(HHO),　a　novel　parity-time　(PT)-symmetric　wireless　power　transfer　(WPT)　system　with　reduced　switching　frequency　and　improved　step-down　conversion　ratio　is　proposed,　where　the　power　transferred　to　receiver　side　is　carried　by　the　$n$　th　harmonic.　We　demonstrate　that　constant　current　(CC)　and　constant　voltage　(CV)　independent　of　coupling　coefficient　and　load　resistance　can　also　be　obtained　without　wireless　communication　and　additional　dc-dc　converters.　Here,　a　new　implementation　of　a　negative　resistor　based　on　the　$n$　th　harmonic　operation　is　proposed,　which　is　a　necessary　condition　of　a　PT-based　system.　In　contrast　to　the　standard　PT-based　system　with　the　same　resonant　frequency,　the　switching　frequency　is　reduced　to　1/　$n$　due　to　the　use　of　the　$n$　th　harmonic,　thereby　realizing　low　switching　losses　and　high　system　efficiency.　Besides,　an　inherently　improved　step-down　conversion　ratio　can　be　obtained.　A　prototype　with　a　6-A　charging　current　and　a　36-V　charging　voltage　is　built　to　verify　the　feasibility　of　the　proposed　method.