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In order to improve the photocatalytic properties of P25, using urea, thiourea and methionine as modifiers, the modified catalysts N-P25, S-P25 and N,S-P25 with visible light catalytic activity are prepared by grinding-calcination method, respectively. The properties of modified photocatalysts are characterized by scanning electron microscopy (SEM) and UV-Vis absorption spectroscopy, and the degradation property of acid red B in visible light by the modified photocatalysts is investigated. The results show that the wavelength ranges of light response of the N-P25, S-P25 and N,S-P25 modified photocatalysts expands, intensive absorption appears in both ultraviolet and visible light regions; the N,S-P25 prepared under the condition of calcination temperature of 700 ℃ and calcination time of 20 h has the highest catalytic activity on the degradation of acid red B, and the degradation reaction of acid red B in visible light conforms to the apparent first order reaction kinetics. The study proves that the modified P25 catalyst can improve the photocatalytic degradation of acid red B under visible light conditions, and enriches the research ideas of photocatalytic degradation of dye wastewater in visible light.