In order to simulate firing accuracy of antiaircraft gun, by using the virtual prototype of ADAMS dynamic simulation software and MATLAB/SIMULINK simulation software of control system, the antiaircraft gun servo control dynamics system mechanical model and servo control model were built. Cosimulation was carried out by ADAMS/Control and MATLAB/SIMULINK module electromechanical integration, improved the reliability of servo control system, and the static and dynamic analysis of control system. The simulation result shows that the electromechanical cosimulation model meets the dynamic and static performance of fire control system, while achieves fast tracking control of load changes, improving antiinterference ability, and has quite high firing accuracy.