In order to fabricate carbon / carbon composites. a prepreg of the carbon fiberphenolic resin composite was prepared and fabricated into a laminate. These composites were first-carbonized under inert atmosphere by following three methods : 1) first-carbonized samples were impregnated with phenolic resin-methanol solution and recarbonized by raising temperature to 1000℃, 2) first-carbonized samples were impregnated with molten pitch and recarbonized by raising temperature to 1000℃, 3) first-carbonized samples were imprenated with molten pitch and recarbonized by raising temperature to 2300℃. The mechanical, physical and thermal properites of the three kinds of samples were compared each other. The samples impregnated with molten pitch and heat treated to 2300℃ were a little poorer than others in the flexual strength. However Young''s modulus of samples treated to 2300℃ was increased and elongation at break was the lowest. Also these samples were superior to other sample impregnated with molten pitch or phenolic resin in the point of oxidation resistance, inflammable resitance and thermal stability.