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The noise suppression effect and its mechanism are investigated for a composite sheet and a composite film made of glass-covered amorphous CoFeSiBCr wires.Both samples show a significant noise suppression effect.The power loss ratio of the composite sheet is above 80％ from 1.6 GHz to 8.5 GHz,and that of the composite film is above 70％ from 3.2 GHz to 8.5 GHz even if its thickness is only 0.20 mm.The composite sheet demonstrates high real and imaginary permittivity above 30.7 and low real and imaginary permeability below 1.2.The surface resistivities of the two composite samples are as high as about 3 × 1012 Ω/square.The power loss of the composite containing glass-covered wires should be mainly contributed by dielectric loss derived from electronic polarization and relaxation.