Abstract: Vibrating wire theory provides a high accuracy alignment method, applying vibrating wire theory to magnets pre-alignment on a girder will greatly increase the alignment accuracy between the magnets. This paper introduces briefly the pre-alignment scheme of magnets on a girder. According to the scheme and the vibrating wire theory, it introduces a scheme of data acquisition and processing for a vibrating wire system. This paper also analyses and solves the key problems including sensor work point alignment, wire current measurement, data acquisition devices selection, magnetic induction intensity calculation and magnetic center calculation. Finally, it presents the experiments of feasibility and accuracy verification.