The　resonant　power　converters　at　tens　of　MHz　operate　most　efficiently　at　fixed　frequency　and　fixed　duty　cycle.　However,　the　increase　of　distributed　parameters　and　parasitic　parameters　will　lead　to　circuit　detuning　at　high　frequency,　resulting　in　the　deviation　of　the　system　from　the　optimal　working　point.　In　this　paper,　an　iterative　commentsoptimization　analysis　method　on　parameter　sensitivity　is　proposed.　It　combines　the　rectifier　and　matching　network,　and　obtains　the　input　voltage　of　rectifier　that　meets　the　working　requirements　of　matching　network　and　rectifier　simultaneously　by　numerical　iteration　to　ensure　the　resonant　matching　state　of　the　converter.　A　prototype　with　20　MHz,　18　V　input　and　10　V　/　10　W　output　is　built.　The　prototype　works　well　and　the　efficiency　is　81.4%　at　full　load.　The　experimental　results　verify　the　effectiveness　of　the　proposed　parameter　sensitivity　analysis　theory　and　the　feasibility　of　its　guiding　experimental　debugging.　©　2024　IEEE.