Abstract: A catalyst for obtaining pyromellitic dianhyride by catalytic gaseous phase oxidation from durene are developmented. The catalyst contains Ce-Mo-Ti-V as essential active constituent. The types of carriers, active constituent as well as the influence on the processing result, some processing conditions such as the temperature, the speed of air and the concentration of the reactors, have been studied through experiments. By using the catalyst, at 455℃, space veiocity 6 000 h^－1 and durene concentration in air 20g/m³,the weight yield of pyromellitic dianhyride is 99.7%.