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Stress graphitization of the hard-carbon matrix in the thermosetting resin based carbon/carbon (C/C)composites has been reported.The stress induced at the fiber-matrix interface due to the restriction of the shrinkage of thermosetting resin by the fiber reinforcement during carbonization has been suggested to be responsible for the graphitization of the hard-carbon matrix.In this investigation, micro-Raman analysis was shown to be capable of characterizing the stress graphitization phenomenon of C/C composites.The distribution of stress graphitization and the effect of interfacial bonding between fiber and matrix on the stress graphitization in the phenolic resin based C/C composites will be investigated.