Abstract: The technical target ,the scheme,the type of valve and the design of nozzle for the design of the digital valve system used to controll mass flow and pressure are introduced in this paper for power simulation testing in FL-3 wind tunnel.The experimental results show that the measuring accuracy of mass flow and pressure control is ±5g/s respectively for the digital valve system,and the digital valve also has the advantages of quick and stable control.The digital valve system can satisfy the demand of accurate control of the flow rate and pressure for aircraft power simulation testing in the FL-3 wind tunnel.