Focused　on　multi-order　high　frequency　resonant　converter　for　electrodeless　lamp,　this　paper　expounds　operating　principle　and　steady-state　characteristics,　leading　to　key　issues　of　load　matching.　When　starting　up,　electrodeless　lamp　needs　high　trigger　voltage　for　its　large　equivalent　resistance.　Lamp　resistance　suddenly　decreases　as　soon　as　it　lit　up.　The　converter　outputs　maximum　power　and　zero　voltage　switching　is　realized　in　steady　state.　From　these　aspects,　theoretical　analysis　and　mathematical　deduction　are　carried　on.　Matching　scheme　suitable　for　electrodeless　lamp　load　characteristics　and　the　design　of　key　parameters　are　obtained　taking　into　full　account　the　features　of　electrodelss　lamp　at　different　operating　stages.　Based　on　the　proposed　design　method,　a　laboratory　prototype　adapts　to　different　working　conditions　has　been　built.　Experimental　results　were　proposed　to　confirm　validity　and　effectiveness　of　the　scheme　presented.　©,　2015,　Chinese　Machine　Press.　All　right　reserved.