Abstract:Artillery fire control system is the core of automatic, semi-automatic weapon,fire control system design directly affects the design of artillery precision, responsiveness, reliability and other performance indicators.The design parameters of gun fire control system, based on mathematical modeling PWM power amplifier and DC motor ,establishes current loop, velocity loop and position loop three closed-loop system mathematical model, the model in real time through SIMULINK ,the simulation results show that, the PI ring controller design to meet dynamic and static performance of fire control system , speed up the system response speed, resistance to load disturbance, good fast-tracking capabilities and high pointing accuracy.