Abstract: Three different ways were proposed to improve the wave absorbing properties of SiC within the frequency ranges from 2 GHz to 18 GHz. Adding 10% nickel powder with average size of 0.2μm to 80% of SiC by weight, the absorbing properties are greatly improved, and the lowest reflection is -23.59dB at 11.35 GHz with the thickness of 0.67mm. A microscopic multi-layer was prepared by electroless nickel plating on the surface of SiC particles, which exibits lower reflection of -22.07dB with the thickness of 0.35mm and 60% by weight at 16.24GHz. Furthermore, better characteristics of reflection and broader frequency ranges are obtained by a macroscopic multi-layer constructed with different ranking of nickel and SiC layers.