Ultrasonic suspension technology has the function of suspension and friction reduction, which can reduce the friction between the rotor and the stator, and the suspension force generated by the ultrasonic wave can be free from the suspension material. Firstly, according to the fluid dynamics, the basic equations of the ultrasonic extrusion film were deduced. The force of the ultrasonic extrusion film was deduced theoretically and numerically solved by the highorder difference method. The relationship between film force and suspension gap, ultrasonic amplitude, air pressure and ultrasonic frequency was analyzed. Effects of these parameters on the ultrasonic suspension performance were discussed. Then, the suspension force of the concave ultrasonic gas extrusion film was obtained by plane extrusion film force decomposition and synthesis. The effect of rotating speed on the suspension force of concave extrusion film was studied. The suspension force of the ultrasonic squeeze film was applied to the unbalanced rotor system, and the vibration response of the rotor system was numerically simulated. The results of each case were compared to explore the vibration suppression effect under different parameters. Finally, an experimental platform for the ultrasonic suspensionrotor system was designed and built. The vibration responses of the rotor system with different parameters were tested to verify the vibration suppression performance by using the ultrasonic suspension technology.