In this study, we use the spiral yarn by the electroless nickel plated to gain the electromagnet wave absorbent effectiveness. First of all, we transform linear polyester yam into spiral yarn by thermosetting, after that we let spiral yarn plated nickel by electorless plated. The final step, we put them into thermosetting composites resin to fix their shape and make them have the electric conductivity. By the electric conductivity of the spiral yam, we expect that it'll induce electro-magnetic induction to absorbent electromagnet wave. At 80℃ and 40 minutes of the electroless nickel plated process, the spiral yarn have the best cover with nickel. And by this experiment, we find that the absorbent electromagnet effectiveness wave of the single composites with spiral yarn is less than spiral yarn composites covered by the linear cupper composites. We fixed the distant of the spiral yam 0.5 cm, the length is 8 cm and cover with 5g linear cupper can get the best value of electromagnet wave absorbent.
