Carbon/carbon composite has good mechanical properties and biocompatibility, but has no bioactivity. Titanium oxide film was deposited onto the carbon-carbon composite using ion beam enhanced deposition, then subjected to alkali treatment, heat treatment in vacuum, immersion in the simulated body fluid (SBF) and scratch test. It was found that a porous network of sodium titanate gel was formed after the titanium oxide film was alkali treated, and the gel layer could induce deposition of bioactive apatite layer in SBF. The porous gel layer became denser and the apatite deposition rate was decreased after heat treatment. The scratch test showed that the bonding strength of the alkali treated titanium oxide film was slightly increased after heat treatment, but bonding strength of the films was limited by the soft carbon/carbon composite substrate.