In the high-purity water project, water treatment membrane technology is mainly used for the preparation of ultrapure water in the electronics, pharmaceutical and other industries. Reverse osmosis membrane (RO) and electrodeionisation (EDI) technologies are key technologies in high purity water preparation, they can effectively remove ions, organics and micro-organisms from water to ensure that the water quality reaches the required purity. In addition, ultrapure water polishing technologies, such as mixed-bed ion exchange, further purify the water to meet the extremely high water quality requirements of the semiconductor and pharmaceutical industries. The application of these technologies enables high-purity water projects to meet the needs of high-end fields such as the production of precision electronic devices.