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The purpose of surface modification of titanium and its alloys is the formation of a stiffening layer and in the improvement of seizure. If the surface layer is an anatarse type TiO 2 , photocatalysis can occur in titanium alloys. The substrates used in this study were CP Ti, a＋b type Ti 6Al 4V, and b type Ti 15V 3Cr 3Sn 3Al. In the pretreatment, an alkaline titanate layer was integrated with the substrates through 5 kmol･m-3  NaOH or  KOH treatments at 333 K for 345.6 ks. Since the oxidizing was done in a suitable atmosphere and temperature, photocatalysis occurred via ultraviolet irradiation along with that generated by the anatarse type TiO 2. The photocatalysis of the a type alloy that generates anatarse type TiO 2 easily is superior to that of the b type alloy. In addition, the a＋b 2 phase structure alloy was superior in photocatalysis to the a single phase alloy.

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