In order to exert control torque upon the launch device to improve the firing accuracy, the dynamics model of multiple automat system was set up by means of correlative modeling software. This paper mainly studies the recoil dynamic response of multiple automat system under the combined effect of the internal and external energy. The bursts of fire dynamic simulation of 3 kinds of patterns on two Gatling guns as such as the same firing positing, difference of 30° or 60° were performed respectively. And compared with recoil and torsion torque variation trend of 3 kinds of pattern. Simulation results indicate that offsetting torque and reducing the recoil can improve the firing accuracy of multiple automat system with future league gives reference to the design of automation system.