In order to realize the low cost and portable application of GMI sensor,a new type of GMI sensor detec-tion system is proposed and studied. The novel GMI sensor detection system consists of a signal source,a V/I con-version circuit and a lock-in amplifier. In the range of 1 MHz to 10 MHz excitation signal frequency range,the newtest system of Ni Fe/Cu/Ni Fe sandwich structure GMI sensor were measured,and with the HP 4194 A impedance ana-lyzer measurements under the same conditions results are analysis and c...