A new fuel regulator drove by linear ultrasonic motor is proposed to overcome the shortcomings of the conventional fuel regulator in a turbofan-11engine, such as a complicated structure, slow response speed and low threshold of disturbance by electromagnetic interference. In this paper, the fuel control mechanism of the fuel regulator based on the linear ultrasonic motor is studied, and the actuator′s movement model of the fuel regulator is established. Meanwhile, the motion equations are deduced among the three courses of the acceleration phase, steady speed phase, deceleration phase. On this basis, the regulative time of the fuel regulator is analyzed through the numerical calculation method and experimentally proven. The results shows that the regulative time of the new fuel regulator is up to millisecond, which is 1-2 orders shorter than the conventional fuel regulator. It can thus adjust aircraft flight states more quickly, which can effectively enhance the mechanization and viability of the aircraft.