This study use the characteristics of the conductivity of the copper and carbon fiber to prepare a plain weave fabric with the two fibers, copper for the warp yarns, the carbon fibers as a weft yarn, the warp yarn fabric of the different-gauge copper wire, coupled with the absorption of electromagnetic waves space materials, the way to change the number of carbon fibers to do the electromagnetic wave test. From experiments result, the electromagnetic absorption is better because the copper wire gauge is better, the smaller the copper wire gauge, poor absorption due to the tension Ambassador voids cause multiple reflection With different place found that the more number of carbon fibers, conductive is better, so electromagnetic waves is good.