A new type of hollow ultrasonic motor connected by a screw was proposed to drive an aperture and control and adjust the intensity of the beam. According to the characteristics of a limited angle of rotation for the aperture, the screw was used to connect the stator and the rotor of the ultrasonic motor to apply a pre-pressure to the axial and to implement the circumferential movement of the coupling. The motor is consist of a rotor, a stator and a base and the rotor and aperture were fixed in a setting ring, by which the diaphragm integrated design was realized. The stator modal was analyzed at an operating frequency of 38.26 kHz by using the finite element software. As motor pre-axial movement brings greater pressure changes, the motor has a smaller rotory angle and can not drive the aperture to open or close. To overcome the pre-pressure changes, flexible design of the rotor was performed. Simulation results show that,at default rotation 90 ° range, pre-pressure changers are within 27% of the variation. Tests show that the stator has excellent vibration characteristics,and its interference from work modal is 5 kHz or more; the impedance variation is not more than 10%,and the pressure change has a little effect on the motor.Furthermore, opening time of the aperture is 5 s, and its closing time is 4.4 s. The diameter of the aperture shows a linear relationship with motor run time. The motor meets the demands of aperture adjustment,and is charaterized by simpler structure and a few aparts.