Abstract: By controlling pressure, velocity and other parameters based on cavitation jet cleaning technology, a lot of cavitation bubbles are formed when water beam goes through cavitation nozzle.Cavitation bubbles will collapse in a narrow area of material surface and produce a micro-jetting impact as high as 140-170 MPa, which realizes the cleaning for underwater facilities.This technology is compared with the high-pressure water cleaning technology in cleaning mechanism, coating protection, efficiency and energy consumption.Results show that the cavitation jet cleaning technology has the following advantages such as high efficiency, safety, energy saving and coating safety. In the submarine Christmas tree cleaning project of Indonesia, the cavitation jet cleaning technology was successfully used in cleaning the joint adapter, hydraulic valves, positioning disc and other facilities. Prospect and future development for this technology in cleaning industry of offshore structures, undersea oil facilities, ships, coastal engineering and so on can be seen.