As　an　important　role　in　electromagnetic　interference　(EMI)　solving　of　switching　power　supply,　the　EMI　filter＇s　performance　and　integrated　design　are　of　great　significance　to　improve　the　power　density　of　switching　power　supply.　This　paper　combines　the　basic　means　of　magnetic　integration　and　electrical　integration　of　the　filter　and　utilizes　the　integration　advantages　of　flexible　multilayer　foils　(FMLFs)　to　integrate　the　common　and　differential　mode　inductor　and　Y　capacitor　of　the　filter　into　a　unit　module.　At　the　same　time,　the　design　value　of　the　differential　mode　inductor　is　increased　through　the　decoupling　design　of　the　common　and　differential　mode　inductor.　Compared　with　the　traditional　discrete　filter,　the　integrated　filter　omits　the　Y　capacitance　and　reduces　the　X　capacitance,　which　can　effectively　reduce　the　board　area　of　the　EMI　filter　on　the　premise　of　consistent　performance.　Combined　with　the　design　process　of　the　integrated　filter,　to　improve　the　integration,　this　paper　mainly　discusses　the　process　of　core　selection,　performance　prediction,　and　performance　modeling,　and　finally　verifies　the　feasibility　and　effectiveness　of　this　scheme　through　a　noise　comparison　experiment.　©　2022　IEEE.