In this study, we use the spiral copper and put them into thermosetting composites resin to fix their shape and make them have the electric conductivity. To understand the characteristic of the spiral copper, we change several factors, such as the content, length, and bore diameter to measure the absorbent effectiveness of the electromagnetic wave. In this study, the electromagnetic wave absorption of copper wire match spiral-shaped is better than single-layer plate. Further more, the spiral-shaped plate matches 5 g copper wire the electromagnetic wave frequency is broader. When the spiral diameter is 0.3 cm, the length is 14 cm, the content is 5 g matches 5 g copper wire, the highest electromagnetic wave absorption is 37 dB.
