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Stuffing the needled carbon felts preform via chemical vapor infiltration (CVI) (propylene as precursor) or resin impregnation/carbonization (phenolic resin as precursor) or combining the two processes results in three types of low-density carbon/carbon composites (LDC/C) with various carbon matrixes. The performance factors involving density, porosity, thermal conductivity (TC), impurity, compressive strength, composition of three LDC/C composites are investigated systematically. The microstructures of LDC/C composites are analyzed to clarify the relationship between the performances and preparation process. The density, TC, and compressive strength of resin solution rise with growing CVI time and resin solution concentration, correspondingly. Dual carbon matrix LDC/C composites have greater TC and compressive strength than two single carbon matrix LDC/C composites. The resin carbon matrix LDC/C composite has greatest ash content of the three, which may be attributable to the considerable quantity of indecomposable impurity originating from the phenolic resin.