A kind of Ag/TiO2 coated composite was synthesized via a soi-gel method. The synthesized products were characterized physically by X-ray diffraction ( XRD) and scanning election microscopy (SEM). Under the effect of magnetic field and photocatalyst, the effects of different heat treatment temperatures, holding time and illumination time on acid red B degradation were studied. The results showed that there was a characteristic absorption peak of Ag at 26 = 44.5°,this indicated that TiO2 and nanometer Ag had already combined together,this catalyst had better catalytic activity comparing with pure TiO2; at the heat treatment temperature of 400 ℃ , the photocatalytic activity reached the greatest, the catalytic properties was the best with 60 min holding time; with the increasing of illumination time, the degradation rate of acid red B improved continuously.%采用溶胶-凝胶法制备了TiO2包覆纳米Ag光催化剂,利用XRD和SEM对其进行表征；在磁场中光催化剂的作用下,研究不同热处理温度、保温时间、光照时间对该催化剂降解酸性红B的影响.结果表明,在2θ =44.5.处出现了Ag的特征吸收峰,这说明TiO2和纳米Ag已经很好地结合在一起,该催化剂比纯TiO2有更好的催化活性；在热处理温度400℃时,其光催化活性最大,60 min的保温时间催化性能最佳；随着光照时间增加,酸性红B染料的降解率不断提高.
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