This standard specifies the quality control principles, requirements and methods of drinking water quality inspection, which is applicable to the whole process of drinking water quality determination. By defining the objectives of quality control and the sources of analytical errors, this standard aims to ensure the accuracy and Reliability of analytical results. The standard also details the production of calibrated Linear dispersion and the representation of errors. It provides systematic mass management guidance for water quality analysis laboratories and helps to improve the scientific and precision of inspection work.