Abstract: According to electromagnetic spreading regulation and transmission line theory,a kind of light wideband three-layered radar absorbing coating with magnetic metal powder and short conductive fiber were prepared.Microwave properties of the radar absorbing coatings were analyzed by the vector network analyzer.The addition of electrical conductive fiber layer widens the absorption frequency range in X-and Ku-band（8-18GHz）.It is found that the surface layer containing short conductive fibers has an absorbing bandwidth of 7GHz under-10dB reflection,which is much wider than that of sole absorbers in X-and Ku-band（8-18GHz）.The addition of electrical conductive fiber lowers the density of the coating at the same time.