In　the　wire　energy　transmission　system,　the　loss　caused　by　the　magnetic　coupling　system　is　one　of　the　main　components　of　the　system　loss,　which　is　related　to　the　loss　on　the　receiving　coil,　the　transmitting　coil　and　the　core　loss.　The　traditional　plane　spiral　coil　is　selected　and　the　basic　parameters　of　the　coil　and　magnetic　core　are　designed,　including　the　design　of　the　inner　and　outer　radius　of　the　coil,　wire　type,　number　of　turns　and　turn　spacing,　as　well　as　the　inner　and　outer　radius,　thickness　and　distribution　of　the　magnetic　core.　The　calculation　of　AC　resistance　at　high　frequency　and　the　influence　of　various　parameters　on　the　coupling　coefficient　are　analyzed.　Smaller　AC　resistance　and　better　coupling　coefficient　are　obtained　in　different　occasions,　which　can　reduce　the　system　loss　and　improve　the　overall　efficiency.　©　2023　IEEE.