Abstract: SrTiO₃ was supported on HZSM-5 molecular sieve by sol-gel method. XRD, FTIR, and N₂ adsorption-desorption measurements were carried out to study the influences of supporting on photocatalytic degradation process of reactive brilliant red X-3B. The processes in photocatalytic degradation of reactive brilliant red X-3B were discussed after analyzing the data of FTIR spectra, ultraviolet-visible spectroscopy, and total organic carbon (TOC) data of the solutions during degradation. The results show that the photocatalysts are mainly composed of perovskite SrTiO₃. Crystallite size of SrTiO₃ has nearly no change after supporting. Pure SrTiO₃ does not have apparent porous structure, so that specific surface area and pores of the supported samples are mainly provided by HZSM-5. Photocatalytic activity of the supported catalysts is obviously improved with the fastest decoloration and TOC removal rates on 30% SrTiO₃/HZSM-5 for reactive brilliant red X-3B.