Abstract: Epoxy resin composites with carbon nanotubes and SiC particles as the absorber were prepared, and their absorption properties were tested, and the relationship between carbon nanotubes, SiC particle content and the absorbing properties of composite materials were investigated.The results show that carbon nanotubes, SiC particle content have great effect on microwave absorbing properties.With carbon nanotube content increasing, the absorption properties of carbon nanotube/epoxy composites first increase and then decrease, and carbon nanotube content has an optimal value（12%, mass fraction）.When the SiC particles are filled into carbon nanotubes/epoxy composites, the absorption properties of composites are improved.SiC particles filling content also has an optimal value（6%, mass fraction）.