Introduction: In the daily operation of the reverse osmosis system, it is inevitable that the inorganic scale of the system, the deposition of colloidal particles, the breeding of microorganisms, chemical pollution and other problems will occur. These factors affect the safe and stable operation of the system. The maintenance of membrane elements can be summarized into two major aspects: one is the pretreatment of reverse osmosis, and the other is the washing, cleaning and maintenance of reverse osmosis equipment. No matter which aspect, the ultimate goal is only one: to extend the service life of membrane elements and maintain the performance of membrane elements. Based on the practical application of the reverse osmosis membrane of Blue Star Toray, this topic introduces the precautions and maintenance methods of the reverse osmosis membrane device operation.