Abstract: A photocatalyst of CdS nanocrystals doped with TiO₂ supported bamboo charcoal was prepared by a hydrothermal method in the different temperature.The as-synthesized samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),nitrogen adsorption in low temperature and UV-Vis diffuse reflectance spectra.The XRD and SEM results showed that the as-synthesized TiO₂ was anatase phase and its size was about 20-40nm.The UV-Vis diffuse reflectance spectra indicated that in the visible region,the absorption edges of the CdS nanocrystals doping TiO₂ supported on bamboo charcoal shifted to visible light region,thus largely enhancing the TiO₂ absorption of visible light.A xenon lamp(λ420nm) was used as an illuminant in the degeneration experiment and Rhodamine B(RhB) was chosen as the model substance to evaluate photocatalytic activity of the CdS nanocrystals doped with TiO₂ supported bamboo charcoal.The results showed that the photocatalytic activity of the CdS nanocrystals doping TiO₂ supported bamboo charcoal synthesized at 240℃ when the doping amount of CdS nanocrystals is 4%(mol fraction) is best,the colour removal of Rh B is 98.2% in 200 minutes.