In this paper, the author collect magnetic field data of geomagnetic platform records in one place and the geomagnetic diurnal change data in another place, then, refer the magnetic field from the geomagnetic platform as the reference and take geomagnetic diurnal change as main magnetic field. The author adopt the Fourier transform to do temporal spectrum analysis of magnetic anomaly, calculate horizon derivative of magnetic field for two place and magnetic respond parameter and apparent resistivity, and do 1-D inversion of electromagnetic. The inversion results are similar to the results from CSAMT method in the same depth sounding section.