Water jet cutting technology, which uses water as a knife, is originally called high-pressure water jet cutting technology. This technology originated in the United States as early as possible. Used in aerospace military industry. Because the cold cutting will not change the physical and chemical properties of materials, it is popular. After continuous improvement of the technology, mixed with garnet sand, Emery and other abrasives in high-pressure water to assist the cutting, greatly improving the cutting speed and thickness of the water knife. Water jet has been widely used in ceramics, stone, glass, metal, composite materials and many other industries. In China, the pressure of water jet has reached 420MPa. Some technologically advanced companies have perfected 3-axis and 4-axis water jet cutters, and 5-axis water jet cutters are also becoming mature.

As a new technology and new product, water jet has not been paid attention to by the media because it is a mechanical product, which is less mysterious and scientific than electronic products. Until 2011, Ji Xingang, a water jet expert, creatively created a new way to make the water jet smaller and safer, which changed the situation that the water jet can not be used in dangerous areas. Due to its breakthrough thinking and its influence in the industry, CCTV science and education column made relevant reports on it, and CCTV made a 60 minute interview in 2011. The knowledge of water jet is introduced in detail. Due to the highest ratings of domestic science and education programs, CCTV re edited and repeated in 2012, and played it in prime time for many times. Ji Xingang - with water as the knife, CCTV's science and technology life column made a 30 minute special report on Ji Xingang.