Abstract: The characterization methods are expatiated in this paper. The Fe-N compounds are synthesized by the solid-gas reaction method. The particles’ component and the widely distributed micrometer particles are shown by X-ray diffraction （XRD）, and the electromagnetic performance of the product is tested by the Agilent impedance analyzer. The result of the study shows that the product which is obtained at 550℃,3h,NH₃/H₂=1:1 has the best electromagnetic performance, especially at 1M～1.5GHz.