This　paper　investigates　the　loss　measurement　methods　of　magnetic　component　for　power　conversion　applications.　A　comparison　calorimetric　method　is　proposed　for　magnetic　component　losses　measurement,　and　the　proposed　method　can　eliminate　measurement　errors　of　traditional　calorimetric　method.　The　measurement　principle　is　introduced　in　detail　and　this　method　is　realized,　and　possible　sources　of　error　in　measurement　are　evaluated　and　addressed.　Hysteresis　control　is　utilized　to　achieve　automated　measurement.　Resistor　and　air-core　inductor　are　used　to　verify　the　accuracy　of　the　proposed　method.　The　results　show　that　the　proposed　method　can　be　used　to　measure　loss　of　resistor　and　inductive　element　for　high　frequency　up　to　5MHz,　and　the　range　of　loss　is　0.1W　to　10W.　IEEE