Aiming at the problem that the hard and brittle materials are difficult to process, the ultrasonic shank is designed on the basis of the traditional shank. Taking the ultrasonic shank with longitudinal vibration as the research object, the modal and harmonious response analysis is carried out by using Ansys, and the vibration mode and amplitudefrequency curve of each node of the shank are obtained. The simulation results show that the ultrasonic shank has an axial longitudinal vibration mode near the frequency of 23 kHz, and its vibration node is located on the cone on the horn. The amplitude and impedance curve of the ultrasonic shank holder and tail are measured by a laser Doppler vibrometer and impedance analyzer. The test results show that the resonance frequency is 23.9 kHz and the maximum amplitude is up to 10.54 μm, which is basically consistent with the simulation. Finally, by installing a balance ring on the handle, the amplitude of the shank is increased while the amplitude of the tail of the shank is reduced, which improves the accuracy and stability of the ultrasonic shank in actual processing.