Out-To-in　(O2I)　body　wireless　communication　is　crucial　for　achieving　personalized　parameter　modulation　and　ensuring　reliable　cardiac　rhythm　management　in　leadless　cardiac　pacemakers.　Compared　to　traditional　radio　frequency　(RF)　wireless　communication　technology,　magnetic　resonance　coupled　human　communication　(MRC-HBC)　technology　is　a　promising　method　of　O2I　communication　that　utilizes　human　tissue　as　a　conduction　medium　for　electrical　signals.　In　this　paper,　we　present　an　O2I　body　communication　method　that　combines　low　power　consumption　and　high　reliability　for　leadless　cardiac　pacemakers　to　enhance　the　performance　of　programmed　management　of　leadless　cardiac　pacemakers　(LCPs)　and　prolong　the　operating　life　of　the　pacemakers.　Based　on　the　dielectric　properties　of　human　tissues,　a　transceiver　coil　was　designed　for　executing　O2I　body　magnetic　resonant　coupling　signal　transmission.　An　O2I　body　multilayer　electromagnetic　model　for　finite　element　numerical　computation　was　further　constructed,　and　a　chest　phantom　experimental　platform　was　built　for　mutual　verification.　The　results　show　that　the　highest　channel　gains　of　simulation　and　phantom　experiment　is-35.02　dB　@　13.56　MHz　and-27.84　dB　@　13.56　MHz　respectively,　when　the　relative　distance　between　the　transceiver　coils　is　in　the　range　of　8-12　cm,　which　represents　a　significant　advantage　over　the　RF　wireless　communication　methods　used　in　previous　studies.　©　2024　IEEE.