Abstract: When pilch-base carbon fibre add in the polyethylene resin with different proportions(0-25 wt%), a new composite materials arc made. The change of heat resistance, mcchnical and electric properties of the composite materials arc studied. The results of experiments show that tensile strength, bend strength, bend modulus and heat deformation temperature of the composite materials are increased with the increase of carbon fibre content. On the contrary, the notch impact strength and the puncture voltage are decreased.