As　the　components　operating　at　high　frequency　and　switch　mode　excitation,　parasitic　parameter　extractions　of　power　electronics　magnetics,　such　as　transformer,　have　many　special　issues.　A　parasitic　capacitance　related　with　leakage　inductance　and　winding　resistance　in　the　lumped　circuit　model　of　a　transformer　is　found　to　be　significant　in　transformer　circuit　model.　The　influence　of　eddy　current　effects　and　magnetic　field　distributions　due　to　high　frequency　and　winding　arrangement　on　the　capacitance　are　considered　and　FEA　simulation　model　is　proposed　to　calculate　the　capacitance.