Flaky　Fe4N　powders　were　prepared　by　nitriding　the　flaky　iron　powders　after　ball-milling.　Various　bulk　samples.　were　formed　with　10　wt%　paraffin　as　a　binder　to　measure　the　complex　permeability.　The　effect　of　ball-milling　time　on　the　aspect　ratio,　BET　specific　surface　area　and　the　permeability　of　the　powders　were　investigated.　The　results　show　that　the　as-prepared　pure　phase　Fe4N　flakes　have　large　aspect　ratio　with　uniform　thickness　smaller　than　their　skin　depth.　The　samples　with　flaky　powders　show　higher　complex　permeability　than　the　one　with　raw　granules　in　certain　frequency　range,　but　exhibit　different　dispersion　characteristics.