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TiO2 is an energy efficient photocatalytic functional material,and incorporation of impurity ions is an important way to improve the activity of TiO2 photocatalysis.Doping approaches with metal ions,non-metallic ions,more ions to increase the photocatalytic activity of TiO2 in recent years are reviewed.The current situation of TiO2 photocatalytic technology is analyzed,photocatalytic reaction mechanism is investigated and doping in different ways to improve the photocatalytic properties of TiO2 is discussed in detail.