Design a sensor array which matches with the excitation frequency applied in magnetic induction tomography（ MIT） system is essential to improve precision of image reconstruction. Aiming at structure of sensing coil used in MIT

research on corresponding relationship between structure parameters of coils and its impedance in frequency domain

which includs coil turns and diameter of coil. Experimental results indicate that increasing coil turns or diameter can lead to coil impedance response curve shift to area at low frequency. The effects caused by differet structure parameters in sensor design for MIT should be cooperatively considered together in order to the optimiaed coil structure match with working frequency of MIT system effectively.