Titanium dioxide's applications are limited for its wide band gap and low light quantum efficiency, so it is necessary to modify TiO2 to overcome the two problems. RE ions doping is one of the most effective methods to modify T1O2 for its unique electronic structure and optical properties. The mechanism of the position with impurity for mation energies caused by RE ions doping to improve the photocatalystic activity of TiC>2 is introduced mainly. The in fluences of modification with RE ions to the structure, size of crystal and the spectrum absorption are all summarized. Finally, the problems of the study on RE ions doping and the trend of the development are both summarized.%TiO2较宽的禁带宽度和低的量子转换效率限制了其实际的应用,对TiO2进行改性以克服上述两方面问题一直是光催化领域研究的重点.稀土元素因其独有的电子结构和光学性质,在离子掺杂改性TiO2研究中受到重点关注.主要介绍了稀土离子掺杂改性TiO2所形成杂质能级的位置对改善其光催化性能的作用机理；综述了稀土离子掺杂对TiO2的晶型、晶粒尺寸和光谱吸收的影响；最后提出了目前研究存在的问题及发展趋势.
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