<正>Carbon fiber reinforcedmultilayered(Py C-Si C)n matrix(C/(Py C-Si C)n)com-posites were prepared by means of layer-by-layerdeposition of Py C and Si C and varying Py C-Si C se-quences via isothermal chemical vapor infiltration.Effects of the number of Py C-Si C layer(n=1,2 and 4)on the matrix microstructure,electri-cal conductivity,mechanical and electromagnetic