Abstract: This paper reviewed the research progress of flexible copper clad laminates (FCCL), which covered their development history, classification, composition, market share and manufacturers. Copper foils, polymer films and adhesives as the base materials for FCCL were also introduced. Particularly, the research progress in polyimidebased FCCL was also presented. Based on the analysis of the production technology of FCCL and the polyimide films used, this paper pointed out the current existing problems and development direction in the field of FCCL.