Metal organic framework material Cu3(BTC)2 was successfully prepared by using Cu(NO3)2·3H2O as copper source by hydrothermal method.The paper used the means such as XRD, SEM, and TG to characterize the synthesized samples and took methyl orange and Rhodamine B as target degradation substance to study the property of photocatalyst of Cu3(BTC)2. The result indicated that there are better degradation effect of Cu3(BTC)2 material on Loudanming B The hydrothermal temperature has great impact on the structure of Cu3(BTC)2 and photocatalyst effect.The sample Cu3(BTC)2 has higher photocatalytic efficiency when the hydrothermal temperature is 140℃.Which mainly attributes to that the high crystallinity can produce more photogenerated electron hole pairs and reaction active sites. The experiment has broadened development of photocatalyst technology in control field of environment pollution.