Abstract: Ultrasonic bearing is a kind of non-contact bearing suitable for high speed and high precision, which has broad application prospects. A bidirectional support ultrasonic bearing is proposed. The suspension characteristics of the bearing are analyzed theoretically, and the influencing factors of suspension height are obtained. The prototype of bidirectional support ultrasonic suspension bearing is made, and the maximum speed and performance are tested. The experimental results show that the bidirectional support ultrasonic bearing has good antifriction performance, and its maximum speed can reach 9 364 r/min; When the shaft speed is reduced from 2 000 r/min to 200 r/min, the support time of ordinary ball bearing is 90 s, while that of bidirectional support ultrasonic bearing is 280 s.