1. The standard reference document has been updated. 4. Terms and definitions have been revised, with appropriate additions and deletions. The definition of secondary water supply was deleted, the definitions of factory water and peripheral water were added, and the definitions of centralized water supply, small centralized water supply and decentralized water supply were revised and improved. The definition of detection index is changed from "unconventional index" in the original standard to "extended index". 5. When using different disinfection methods, identify the corresponding detection indicators. 6. The hygienic requirements for disinfectants and disinfection equipment have been increased, and it is clear that disinfectants and disinfection equipment should comply with the provisions of the Hygienic Safety Evaluation Standard for Disinfectants and Disinfectants in Drinking Water (Trial). 7. Deleted the relevant content of water quality monitoring. 8. Improve the implementation standard of water quality inspection method.