In order to meet the requirement to control for UVA,a variable universe fuzzy control algorithm with increment is proposed. The algorithm was used to possess the property of a large adjustable tolerance and a strong robustness,applicable to the non-linear system,thereby to solve the problem in which the cruising Mach number was deflected. The flight simulation is carried out for testing its working state. As a result,by using the fuzzy control method,the dynamic property of the cruising Mach number is impro...