The recent progress of study on nano-TiO2 photocatalysis technology is reviewed, including the mechanism of photocatalysis and factor of effecting photocatalysis.The methods for enhancing nano-TiO2 photocatalystic activity are discussed. The effect approaches are precious metal deposition, composite semiconductor, metal ion-doping, photoactivating, etc. Then some suggestions about the recent progress of study on nano-TiO2 photocatalysis technology were given.