PURPOSE: To improve oxidation resistance by forming a coating layer of SiC or Si3N4 having a specific compsn. on a base material formed by reinforcing the matrix of a compsn. changing continuously from the C in the central part toward the ceramics in the surface part with C fibers.

CONSTITUTION: C powder and ceramics powder of TiC, etc., are mixed to prepare the respective powder mixtures in which the ceramics components are adjusted to 0, 20, 40, 60, 80, 100mol%. These powders are discretely deposited on a woven fabric of the C fibers by an electrophoresis method, etc., to form the composite consisting of the powder mixture of the matrix component and the woven fabric of the C fibers to constitute the reinforcing material. The respective composites are then laminated to form the laminate adjusted to have the compsns, continuously changing to 100-80-60-40-20-0-20-40-60-80-100(mol%). This laminate is dried and tentatively calcined and is then sintered under pressurization in gaseous N2 to obtain the base material. The coating layer which has the surface consisting of the SiC or Si3N4 and has the inclined compsn. with the ceramics on the boundary surface with the base material is formed on one surface of this base material by a CVD method, etc., by which the coated C fiber reinforced composite material is obtd.