Winding　losses　are　critical　in　the　design　of　high-frequency　magnetic　components.　Traditional　analytical　methods,　such　as　Dowell　model　and　Bessel　function　have　been　used　to　compute　winding　high　frequency　eddy　current　losses.　However,　as　the　operation　frequency　of　power　converter　increasing　and　multi-strain　litz　wires　widely　used,　these　methods　bring　much　error.　By　the　deep　analysis　for　the　distribution　properties　of　eddy　currents　on　the　round　conductor　caused　by　skin　effect　and　proximity　effect,　an　improved　analytical　model　is　proposed　which　will　get　the　winding　losses　more　accuracy.　Finite　element　simulations　and　sample　tests　have　effectively　verified　the　accuracy　of　the　proposed　model.　©　2019　Chin.　Soc.　for　Elec.　Eng.