Abstract: 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.