To meet the measurement accuracy of drag coefficient required for the large commercial aircraft aerodynamic tests, it is imperative to improve the control accuracy of Mach number. In this paper, the Mach number control strategy based on dynamic feedforward control is studied. Firstly, the theory and stability of the dynamic feedforward control are introduced. Secondly, the Mach number control model consisting of an electro-hydraulic servo, a static pressure control and perturbation subsystems is constructed. Then, the dynamic feedforward controller is obtained by using the approximate order-reduced method. Finally, through simulation analysis, the perturbation model is verified, and then the control effects of dynamic feedforward control and feedback control are compared. The simulation results indicate that the control accuracy of Mach number is greatly improved.