In　order　to　obtain　the　perturbed　magnetic　fields　caused　by　mechanical　stress,　the　governing　equations　and　boundary　conditions　for　the　problems　were　derived　based　on　the　linearized　magnetoelastic　theory.　For　example,　the　perturbed　magnetic　fields　of　the　half-plane　subjected　to　the　concentrated　force　were　obtained　by　the　procedure　presented　in　this　paper.　The　calculation　results　show　that　the　normal　component　of　magnetic　intensity　is　symmetrically　distributed　around　the　point　of　the　acting　force,　where　the　normal　component　reach　the　maximum　value;　while　the　tangential　component　is　antisymmetrically　distributed　around　the　point　of　the　acting　force,　where　the　tangential　component　inverses　its　direction　sharply.　The　effect　of　magnetic　fields　on　the　displacement　can　be　neglected.　The　magnetic　inductions　of　the　perturbed　fields　are　proportional　to　the　applied　force.