In order to improve the firing accuracy of the terminal anti-missile naval gun, a fuzzy sliding mode control method for servo system is proposed. Using LuGre model, the nonlinear friction in naval gun servo system model is established. The sliding mode control algorithm is used to compensate the friction torque, and the fuzzy rules are used to adjust the sliding mode control gain to reduce chattering. The simulation results show that the fuzzy sliding mode controller reduces the chattering of the control input and improves the tracking stability and accuracy of the naval gun servo system.