Objective To improve the spatial distribution of cavitation activity during ultrasonic cleaning in the central sterile supply department. Methods A hydraulic lifting device and a bracket for fixing aluminum foil were made as auxiliary devices and placed on the ultrasonic cleaning machine, then aluminum foil was mounted on the cleansing basket as the cleansing object in order to record the cavitation distribution.The experimental group utilized the hydraulic lifting device to raise and lower the cleansing basket with 1 cm of height in ultrasonic cleaning, while the control group did not change the height of the cleansing basket. The experiment was repeated 30 times in each of the two groups. Results The erosion area of the aluminum foil was significantly larger, and the erosion was more evenly distributed in the experimental group compared with the control group （both P＜0.05）. Conclusion Up and down of the cleansing basket can increase cavitation distribution and make the cavitation be more evenly distributed, so as to eliminate blind areas in ultrasonic cleaning and improve the cleaning effect.