The　electromagnetic　interference　(EMI)　filter　plays　an　important　role　in　the　EMI　noise　suppression.　As　the　development　of　the　switch　mode　power　supply　(SMPS),　the　power　density　of　the　SMPS　improves　every　year.　As　a　result　the　distance　between　components　becomes　smaller　and　smaller.　The　near-field　magnetic　coupling　between　components　becomes　larger　and　larger.　However　there　are　fewer　studies　about　the　near-field　coupling　between　components　in　the　EMI　filter.　Yet　no　methods　have　been　proposed　to　use　the　parasitic　parameters　to　improve　the　low　frequency　performance　of　the　EMI　filter.　A　new　method　which　contains　a　capacitor　series　in　an　inductor　was　proposed　to　improve　the　performance　of　the　EMI　filter　near　the　series　resonance　frequency.　Also　the　series　inductor　integration　method　by　using　the　near-field　magnetic　coupling　method　was　proposed.　The　series　inductor　can　be　adjusted　by　controlling　the　near-field　magnetic　coupling　of　the　EMI　filter.　The　consistency　of　the　tendency　between　the　experiment　results　and　simulation　results　verify　the　proposed　method　to　be　correct　and　feasible.　It　provides　a　new　idea　for　the　minimization　of　the　EMI　filter.