Carbon-fiber-supported TiO2 photocatalytic material (TiO2/CF) was prepared by sol-gel method with PAN-based carbon fibers as support. Then the TiO2/CF was modified by depositing noble metal Pd particles on its surface by oxidation-redox method at room temperature to obtain carbon-fiber-supported Pd-TiO2 photocatalytic material (Pd-TiO2/CF). XRD analysis shows that TiO2 of anatase was formed on the surface of carbon fibers by sol-gel method. Acid orange II of azo dyes was chosen as the target of photocatalytic degradation, and the photocatalytic activities of TiO2/CF, Pd-TiO2/CF and powder TiO2 of equal load capacity were analyzed by UV absorption spectrum. The results indicate that the photocatalytic activity of powder TiO2 decreased to some extent under the supported condition; Pd particle deposition increased photocatalytic activity efficiently; the Pd-TiO2/CF has much higher photocatalytic activity for Acid orange II solution than TiO2/CF and powder TiO2