By modification, TiO₂ shows relatively high photocatalysis activity in visible light range, which changes the characteristics of only showing relatively high efficiency in UV light irradiation. This paper reviews the researoh developments on modification of nano-TiO₂. It points out that bandgap can be decreased and visible light responsiveness and quantum efficiency of nano-TiO₂ can be increased via element doping, noble metal modification, polymer modification, coupled semicon- ductois, dye sensitization and so on. The analysis suggests that effect of visible light photocatalysis of modified nano-TiO₂ prepared in the lab has already been relative ideal. The future development di- rection is to solve the difficulty of recovery and easy operating in engineering.