According to the time delay and nonlinear characteristics of the airconditioning system in the underground space of the protection engineering, the controller combining predictive control and fuzzy control is designed based on fuzzy predictive PID algorithm. The mathematical model of the system is developed and investigated though the proposed control method. The results show that the designed controller has good ability to resist disturbance. Compared with the traditional PID control, its accommodation time is shorter, and the control effect is much better.