Abstract: Mach number and total pressure is the most important flow field parameter for continuous trans-supersonic wind tunnel, according to the problem of the multivariable decoupling control of flow field parameter for the continuous transonic wind tunnel, taking the 0.6m continuous trans-supersonic wind tunnel as an example, the adjustment principle of wind tunnel flow field parameter is analyzed firstly. Then the decouple control arithmetic of flow field parameter is put forward for the coupling problem of internal parameter and between parameter, including successive approximation prefab control, self-adaption prefab control and model gesture prefabrication compensation arithmetic, and then the total pressure and Mach number is controlled exactly and quickly, combine the multivariable decoupling control framework design of flow field parameter along with the decoupling design of operation control flow for wind tunnel, finally, the wind tunnel blowing verification is carried out. The result indicates that the Mach number accuracy is superior to 0.001, total pressure accuracy is superior to 0.2% in full pressure condition, and the time of Mach number polar curve (9 angles of attack) is within 4 minutes, which proves that the control strategy proposed is effective, and can provide reference for the design and construction of other wind tunnel.