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To resolve the problem how to control the pressure in Wind Tunnel using the altitude simulation control system. The control strategy chooses keeping the speed of water ring pump and adjusting the valve using the increment PID control arithmetic according to the characters of system. Because of adopting the increment PID control arithmetic directly, the oscillation time is long, that can not satisfy the requirement of experiment. The reason is analysised, the method that adopting advance adjust on the basis of increment PID control according to the delay and inertial of the system is suggested, then the opportunity and method are defined, at last, system debugging is carried out. The result indicates that, the pressure control can stabilize in ±100 Pa range less than 300 s, it can satisy the requirement of experiment, and provide reference for the stabilization control to the delay and inertial of the system.