Giant magneto-impedance (GMI) effect has been studied in the sandwiched FeSiB/Cu/FeSiB films in the frequency range of 1 - 40 MHz. With magnetic field, Ha and AC current applied along the longitudinal direction, the field dependence of the GMI ratio shows that the GMI ratio increase with magnetic field, reaching a positive maximum value at a certain field, and then gradually decreases to the negative GMI ratio. At a frequency of 5 MHz the positive maximum GMI ratio is 1.6% at Ha equals 15Oe, and is smaller than the negative GMI ratio, -7.4% at Ha equals 50Oe. With a transverse field applied, at a frequency of 5 MHz a large negative GMI ratio, -12.2% and -15.4% are obtained for Ha equals 70Oe, respectively. The larger negative GMI ratios at relatively large fields may be associated with the dispersion of easy axis and the related domain structures.