This　letter　proposed　a　new　configuration　of　neutral　point-based　common　mode　(CM)　active　electromagnetic　interference　(EMI)　filter　(NP-CM-AEF).　It　is　achieved　by　setting　the　reference　of　filtering　system　to　the　neutral　point　of　equipment　under　test.　Therefore,　CM　noise　could　be　sensed　across　neutral　point　and　ground.　Meanwhile,　compensation　signal　could　be　built　by　op-amp　and　re-injected　to　cancel　the　initial　CM　noise.　The　main　advantage　of　the　proposed　NP-CM-AEF　lies　in　that　no　more　noise　separation　such　as　bulky　passive　CM　transformer　is　needed　to　get　pure　CM　noise.　The　whole　filter　becomes　smaller,　lighter,　and　more　compact　compared　with　traditional　CM　AEF.　Working　principle　is　analyzed　in　details　and　hardware　experimental　tests　are　also　performed.　It　shows　that　the　proposed　NP-CM-AEF　has　a　good　attenuation　to　CM　noise　and　total　size　is　pretty　tiny.