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To solve the flow field control problem that the small capacity of tank and the pressure drops quickly brings in the cascade wind tunnel, the flow field control, the dynamic variable parameter and integral separation PID control algorithm was given. The algorithm can achieve a rapid flow field stability and high precision control of pressure in the cascade wind tunnel. The control delays problem in the atmospheric and pressurization test was solved by using the method which uses the inlet pressure error value of cascade to correct the pressure behind pressure regulator. The result indicates that the variable parameter PID control and the choice of control point having a defined correspondence to correct the actual error have significance for high precision pressure control and hysteresis in the small temporary red wind tunnel.