Based on Langevin-type first longitudinal vibration

a new type of ultrasonic levitation bearing is proposed

and a micro torque testing system which can reduce the friction is presented. An experimental platform was constructed

comparative experiments were made under the working and the non-working condition of the piezoelectric ultrasonic levitation bearing. The experiments testify that the ultrasonic levitation bearing can reduce 80 % of the friction loss of shaft under the working condition.