This standard specifies the technical requirements in the cleaning process of membrane components in reverse osmosis (RO) systems, the preparation work before cleaning, the judgment of contaminants, the cleaning of the system and the acceptance of the cleaning effect. It is suitable for the cleaning of membrane components in reverse osmosis (RO) membrane systems. The standard refers to a series of normative documents, including sewage discharge standards, water vapor mass standards, etc. At the same time, the terms and definitions section clarifies important terms related to reverse osmosis (RO) systems, such as reverse osmosis (RO) membranes, membrane components, membrane modules, etc.