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The flow field control software of the currently proposed transonic wind tunnel has too much pressure on the suction side, which leads to excessive changes in the exhaust velocity of the exhaust valve. A new flow field control software for ejecting transonic wind tunnels is designed, Mach number and Reynolds number are introduced into the wind tunnel control program, and the control quality is tested and tested to realize the wind tunnel system can achieve more accurate and rapid Introduce a decoupling system into the wind tunnel flow field control system to decouple and screen each part of the wind tunnel test parameters, improve the accuracy of each parameter, and help the control system to achieve precise control. The experimental results show that the designed flow field control software of the ejected transonic wind tunnel can effectively reduce the pressure at the exhaust end of the flow field control software of the ejected transonic wind tunnel, so that the air exhaust velocity of the exhaust valve is in a stable state.