The　magnetic　properties　of　2J4　alloy　deformed　by　the　equal　channel　angular　pressing　(ECAP)　have　been　studied　in　different　tempering　temperature,　and　were　contrasted　with　those　of　the　cold　rolling　2J4　alloy.　The　results　shows　that　the　more　the　ECAP　deformation　extent　is,　the　better　the　magnetic　permeability　of　2J4　alloy　will　be,　the　relation　between　them　is　the　positive　pertinence.　The　saturation　magnetic　flux　density　of　2J4　alloy　is　the　best　after　four　passes　ECAP.　Moreover,　the　change　of　the　magnetic　performance　of　2J4　alloy　is　very　sensitive　to　the　change　of　tempering　temperature.　The　best　magnetic　retardation　performances　are　found　in　the　2J4　alloy,　which　is　rolled　with　a　deformation　amount　of　85%,　along　the　extruding　direction　after　four　passes　ECAP　deformation.　Its　coercive　force　reaches　3.8364　kA/m.　The　magnetic　retardation　performance　of　ECAP　2J4　alloy　is　better　than　that　of　traditional　cold　rolling　2J4　alloy.　The　results　favors　that　the　fabrication　of　high　performance　magnetic　material　by　means　of　ECAP　is　feasible.