The nanometric TiO2 photo-catalytic oxidation method is a newly developed water treatment technology in recent years

it can degrade organic matter

and kill micro-organism in water.Compared with traditional micro-organic treatment method

it has advantages of green environment protection

wide range of application

and high catalytic efficiency

etc..The current situation of studying the nanometric TiO2 photo catalytic water treatment technology has been presented

and an approach to several methods for using the said technology into circulating water system of power plants being made

pointing out the key points and research direction of sal new technology in the future.