In order to study the influence of the number of gun hoops on the firing accuracy of the artillery, the modal analysis of the gun barrel group of a new type of artillery was carried out. The finite element analysis was used to analyze the gun barrel group of a new type of gun. The effects of single gun hoop and double gun hoop on the modal frequency of the gun barrel group were considered, and the modal frequency and vibration modes of the gun barrel group under different orders were obtained. The finite element calculation results show that the vibration modes of the two are similar under the same order, but the double gun hoop has lower modal frequency than the single gun hoop, which is far from the actual firing frequency range of the automaton. The modal frequency has a greater margin. The results of the live-shot comparison test show that the dispersion of the double hoop is better.