The basic principle of ultra high pressure water jet is simple and complicated. The key to the formation of ultra high pressure water is the high pressure pump. The low pressure oil from the oil pump pushes the large piston of the supercharger to make it reciprocate. The motion direction of the large piston is automatically controlled by the reversing valve. On the other hand, the water supply system is first purified, then the low pressure water is pumped out by the pump, and the low pressure water entering the supercharger is pressurized by the small piston, and the pressure rises. The pressure of the water jet from the nozzle is fluctuating because the high pressure water is produced by the continuous compression of the supercharger, and the piston of the supercharger needs to be changed. (water cutting) to obtain a stable high pressure water jet, the generated high pressure water is required to enter an accumulator and then flow to the nozzle to achieve the purpose of stabilizing the pressure. The water knife is an ultra-high pressure pressurizer from ordinary water to pressure water to 4000 bar (60000psi), and then through a very small nozzle (its diameter is about 0.1mm to about 0.4mm), a water arrow with a velocity of about three times a second (about three times the sound speed) per second. This water arrow is like a sharp cutting tool that cuts the workpiece that needs to be machined. The components of water jet processing equipment include: super high pressure pump, water jet cutting head device, water knife X-Y movable planar cutting table, CNC controller and CAD/CAM software package. The key equipment is: the ultra high pressure pump increases the water pressure to cut all kinds of materials, the more the high pressure can penetrate a variety of different materials, the cutter head device contains a small diameter jewel nozzle, which is usually used as red or sapphire, which is embedded in the metal material, and the nozzle is installed in the material. Line up and down the micro adjustment rack, so that the high-pressure water arrow can precisely pass through the direction to be processed, without damaging any other parts of the workpiece. This is also an important factor to ensure the accuracy of water jet cutting.