Inductor　operating　at　high　frequency　in　several　hundreds　kHz　range　of　power　converter　will　cause　severe　winding　loss　and　high　temperature　rise.　Based　on　analysis　of　winding　loss　components,　a　novel　core　structure　with　distributing　magneto-motive　force　(MMF)　is　proposed　for　structure　of　high　frequency　power　inductors,　in　which　low　permeability　magnetic　film　is　introduced　in-between　high　permeability　gapped　core　leg　and　windings　to　build　auxiliary　magnetic　path.　In　new　structure,　magnetic　field　in　winding　window　area　is　distributed　more　uniform　than　that　of　simple　lumped　air-gap.　structure,　resulting　in　reduction　of　AC　winding　loss　greatly.　Comparing　with　previous　core　structures,　new　structure　can　be　constructed　very　easily　with　flexible　polymer　composite.　Finite　element　simulations　are　performed　to　analyze　and　verify　winding　loss　reduction　for　novel　core　structure.　Design　guidelines　and　experiments　results　are　also　given.