In　the　framework　of　the　linearized　magnetoelastic　theory,　the　perturbed　magnetic　fields　caused　by　mechanical　stress　and　deformation　were　investigated　theoretically.　Governing　equations　and　boundary　conditions　to　determine　the　perturbed　fields　were　derived.　The　effect　of　mechanical　deformation　on　the　magnetic　fields　was　taken　into　account　by　coupling　structural　displacement　into　the　perturbed　magnetic　field　continuous　conditions　on　the　boundary　of　the　structure.　As　an　example,　the　perturbed　field　of　a　half-plane　magnetized　structure　caused　by　a　point　force　was　calculated　by　the　Fourier　transform　method.　The　results　show　that　the　calculated　magnetic　intensity　component　normal　to　the　boundary　of　the　structure　reaches　its　maximum　at　the　point　force　acted　while　the　component　tangent　to　the　boundary　inverses　its　direction　sharply.　The　magnetic　induction　of　the　perturbed　field　is　proportional　to　the　applied　force.　Magnitude　analysis　proved　that　since　the　applied　magnetic　field　has　a　relative　weak　intensity　such　as　the　Earth＇s　magnetic　field,　influence　of　the　magnetic　field　on　deformation　of　the　structure　can　be　neglected.　©　Higher　Education　Press　and　Springer-Verlag　2006.