Shanghai Winner built a new RO reverse osmosis system based on customer needs to improve the quality of process water. The pure water system was transformed into a secondary reverse osmosis system and then entered into the mixed bed system. The water quality was improved and the frequency of acid-base regeneration of the mixed bed was reduced, thereby reducing the discharge of wastewater. , to achieve the purpose of saving tap water, improving the quality of production water and reducing personnel costs. At the same time, the newly built RO system of Shanghai Winner Environmental Protection is connected to the Ou Liyou DCS system to monitor the operation data in the whole process to provide guarantee for water saving of the whole plant, and to establish a corporate image for environmental protection, energy saving and emission reduction.