As a new function material, carbon fiber (CF) has wide application prospect in radar passive jam. ming for it’s higher conductivity. A copper coating is electrolessly deposited on the surface of carbon fiber, and thena nickel film is deposited on the surface of the copper coating by means of chemical vapor deposition process. Themorphology and composition of the modified carbon fiber are tested with scanning electron microscopy (SEM), ener.gy disperse spectroscopy (EDS) and X-ray diffraction (XRD). The radar cross section (RCS) characteristics of themodified carbon fiber are analyzed by RCS testing system. The results showed that Ni-Cu deposited carbon fiber isuniformly and flatness, which exists in elemental state. The RCS value of the modified carbon fiber is improvedgreatly compared with that of the non-modified carbon fiber and it is close to the theoretical value.