The ferroin-catalyzed Belousov-Zhabotinsky (BZ) reaction was found to exhibit enhanced photosensitivity in the water-in-oil microemulsion of anionic surfactant aerosol OT (AOT). Some novel photoresponses were found in this system. In addition, it was found that illumination always resulted in the reduction of the catalyst in the micelle BZ system. On the basis of the results for the BZ subsystem without malonic acid, the reduction of photoexcited ferriin by AOT was found to be important, together with an additional photoreduction of catalyst with malonic acid in the case of the full BZ system in the AOT microemulsion.