综合介绍了掺稀土离子液体激光器的主要发展历程，分析了掺稀土离子液体激光材料研究过程中需要解决的主要问题包括降低无辐射跃迁、增大溶解度和减少热致折射率梯度引起的光偏折损耗等。重点介绍了稀土离子在溶液中的无辐射跃迁机理以及降低无辐射跃迁的措施。

The main developing process of rare-earth-doped liquid laser is introduced. It has been analyzed that the main problems during the development include controlling radiationless transition, increasing the concentration of rare-earth ions, decreasing deflection losses caused by thermal refractive index gradient and so on. The mechanism of radiationless transition and the corresponding solutions have been mainly discussed.