According to the situation in Gaza, water cutting can be divided into sand free cutting and cutting in Gaza.

To equipment: divided into large water cutting and small water cutting.

According to the pressure: it can be divided into high pressure type and low pressure type, generally with 100MPa as the limit. It is high pressure type above 100MPa and low pressure type below 100MPa. The pressure above 200MPa is ultra-high.

According to the technical principle, it can be divided into front mixing type and back mixing type.

To mechanical structure: divided into cantilever and gantry.

Safety cutting can be divided into safety cutting and non safety cutting. The difference is mainly in the water pressure. Low pressure water cutting below 100MPa can be applied to special industries, such as dangerous chemicals, petroleum, coal mine, hazardous materials treatment, etc. After a large number of experiments, it is found that when the water pressure exceeds a certain threshold, even pure water will detonate some sensitive chemicals, and because the water contains abrasive sand, the potential energy and impact force of sand collide with objects, the energy generated will also cause the instability of special chemicals. After a lot of experiments and demonstrations, the threshold is about 237.6mpa. Therefore, in the water cutting industry, the water cutting above 200MPa is mainly used in the machining industry.