Background:　Signal　transmission　characteristics　between　implanted　medical　devices　and　external　equipment　has　been　a　common　key　issue,　as　has　the　problem　of　supplying　energy　to　the　devices.　It　can　be　used　to　enable　signal　transmission　from　implanted　devices　that　the　human　body＇s　conductive　properties.　Using　signal　transmission　by　galvanic　coupling　is　one　of　the　most　effective　signal　transmission　methods.　Methods:　The　signal　transmission　characteristics　by　galvanic　coupling　of　implantable　devices　using　a　frequency　range　of　10　kHz　to　1　MHz　was　analyzed　in　this　article.　A　finite　element　(FEM)　model　and　a　phantom　model　established　by　visible　human　leg　data　were　used　to　investigate　the　signal　transmission　characteristics　of　implant-to-surface,　with　implantable　receiver　electrodes　at　different　locations.　Results:　The　results　showed　that　the　FEM　model　and　the　phantom　model　had　similar　implantable　signal　transmission　characteristics,　with　an　increase　of　frequency,　signal　attenuation　basically　remained　unchanged.　The　gain　in　signal　attenuation　in　the　fixed　attenuation　values　fluctuated　no　more　than　5　dB　and　signal　attenuation　values　rose　as　the　channel　length　increased.　Conclusions:　Our　results　of　signal　transmission　characteristics　of　surface-to-implant　will　provide　a　theoretical　basis　for　implantable　transceiver　design,　and　for　realization　of　a　recharging　method　for　implanted　medical　devices.　©　2017　The　Author(s).