The development and application of high pressure water jet is conducted in this paper.It shows that cavitating water jet is a new type jet with great potential and good efficiency.The potential of cavitating water jet is further consided by analysing its mechanism,including two impotent cavitation parameters" cavitation number and impulse pressure.The experiments show anificial submerged cavitating jet has better erosion pthennance and longer standoff distance. Finally, the study on the cleaning work of solid propellant in the chamber of rocket engine by cavitating wade jet, is also introduced briefly.