Comparison of cutting properties and environmental effects: laser cutting belongs to hot state cutting, to a certain extent, there is heat effect and damage to the workpiece, but the effect is less than that of plasma such as hot state cutting. Laser cutting, compared with plasma cutting, produces less dust, less light and less noise, and is safer and more environmentally friendly. However, because of the auxiliary gases such as oxygen and nitrogen used by laser cutting itself, it is impossible to realize the safety and environmental protection in real sense. On Baidu, people often ask: is laser cutting machine harmful to the body or what is the harm of laser cutting machine to the human body? This means that people, especially the operators, have been concerned about the safety and environmental protection of laser cutting, and the ultra high pressure water cutting is cold state cutting, and there is no heat impact and damage to the workpiece. The cutting medium water for ultra high pressure water is used as the ordinary tap water, and the garnet sand is the natural ore. It is determined that it will not produce poisonous gas in the process of processing. It is the safest and environmental protection in all cutting methods.