Measurements of the magnetoelectric conversion characteristics were carried out using a giant magnetoresistive ( GMR ) sensor, and the interval of linear relation between the output voltage and the magnetic induction intensity ( 0our-B) was obtained. The magnetic induction intensity on the mid-plumb line of the N.pole of the bar magnet and in the direction of the midline of the hoof opening of the horseshoe magnet were determined using a GMR sensor, Subsequently, a plot of B versus x( position) was plotted and it was found thatit could not be fitted well using the magnetic dipole model ( B ~ x~’ ) .Therefore , a modified magnetic dipole model , i.e., an equation derived by considering the magnet as a number of magnetie dipoles, was used to fit the data better, and can be reasonably explained.