GB/T 606-2003 is a standard in the field of chemical reagents, and it clearly adopts the Karl Fischer method as a general method for determining moisture. In the production, storage and use of chemical reagents, the moisture content greatly affects the purity and stability of reagents. This standard specifies the operation process of the Karl Fischer method in detail, providing a unified and reliable measurement basis for chemists. Through this method, the moisture content of chemical reagents can be accurately determined, the mass of reagents can be effectively guaranteed, and the experimental and production activities in the fields of scientific research and chemical production can be carried out accurately and smoothly, and the standardization development of the chemical reagent industry can be promoted.