Biocompatible carbon/carbon composites have good mechanical properties close to those of bone, which make them great potential as orthopedic implants in human body. Biomedical carbon types as bone implants, its response to bone tissue and bioactive modification of carbon/carbon composites were reviewed. On the basis of this summary, the structure of bioactive coating on carbon/carbon composites, which is composed of hard internal layer inhibiting the release of carbon particles and bioactive layer, is suggested, and the details are also presented correspondingly. Finally, the medical prospects of carbon/carbon composites as bone implants are shown with some problems need to be solved.