The absorption benefit of the electromagnetic wave by changing diameter, length and content of copper wire were measured in this study. Then put copper wires into the thermosetting resin to make the composite panel. From the experimental results showed that the electromagnetic wave absorption of spiral copper wire composite plied with linear copper wire composite is better than single spiral copper wire composite with the 1.5% of copper wire content composite, the rate of electromagnetic wave absorption band is wide. However the copper wire diameter is 0.25 mm, copper wire loading is 1.5%, and the copper wire length is 10.5 cm, the highest electromagnetic wave absorption value can reach 28.031 dB. Furthermore, when the copper wire loading is 1.5%, copper wire diameter is 0.19 mm; the highest rate of electromagnetic wave absorption band can reach 51.8%.
