Abstract: PMMA/TiO2 and PMMA/MMT/TiO2 composite nanofiber membranes were fabricated through electrospinning and sol-gel coating. Light-catalyzed properties of different samples were analyzed and compared through the degradation of methylene blue under UV-light. SEM and FT-IR were employed to investigate the difference between the samples before and after light-catalyzed reaction the morphology of the fibers, the structure of the molecular as well as the chemical contents of the nanofiber membranes. The study has revealed that PMMA/MMT/TiO2 composite nanofiber membranes performed best in methylene blue degradation. MMT not only improved the absorption property of the nanofiber membrane but also prevented the TiO2 membrane from cracking.