The PI/SnO2 films doping with cerium were prepared on flexible polyimide (PI) substrate via di⁃rect ion exchange method. The effect of different preparation conditions on the photocatalytic properties of the composite films were studied. Furthermore, the effects of the doping amount of cerium ion and the con⁃centration of ion exchange liquid on photocatalytic performance were also studied. The films were character⁃ized by SEM, EDAX, XRD and FTIR. The photocatalytic performance of the films was evaluated by the degrada⁃tion rate of the methylene blue. The results showed that the PI/SnO2 composite films with 30% (mass frac⁃tion) cerium, 0.4 mol/L total ion exchange solution concentration and calcined at 330 ℃ for 4 h, had perfect photocatalytic performance. The methylene blue degradation rate reached 94.5% at 2 h and TOC removal rate was 75.3%. The films could be recycled and showed a good degradation performance.%以聚酰亚胺（PI）为基体，采用离子交换法制备Ce掺杂PI/SnO2复合薄膜。考察了不同制备条件对其性能的影响，并进一步研究了Ce掺杂量及离子交换液浓度对复合薄膜的影响。利用SEM、EDAX、XRD、FTIR等对复合薄膜进行表征，并且以亚甲基蓝为模拟污染物，根据对亚甲基蓝的降解率评价薄膜的光催化性能。研究结果表明，煅烧温度330℃，煅烧时间4 h，Ce掺杂量为30%，离子交换液浓度0.4 mol/L时，光催化效果最好，光照射2 h亚甲基蓝降解率可达94.5%，TOC去除率75.3%。回收复合薄膜进行二次利用，降解效果良好。
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