The nano-TiO2 visible-light-induced photocatalytic mechanism is briefly stated. The mechanism is almost the same as that of the ultraviolet-light-induced photocatalysis except for its charge transmission and separation mechanism. The latest research progress of nano-TiO2 visible-light-induced photocatalyst, included ion doping, ion implantation, composite semiconductor, noble metal deposition and photosensitization technique, is reviewed in detail.