This standard specifies a general method for determining the moisture content of samples from bulk bauxite (such as cargo and stockpile). Its core principle involves completely evaporating the moisture in the sample through heating and drying, and calculating the moisture content based on the mass loss before and after drying. This provides critical data support for trade settlement and production quality control of bauxite. The method specifically addresses situations where samples are difficult to handle due to caking or dampness by prescribing a pre-drying step, and outlines moisture correction procedures for instances of water spraying or rainfall during delivery. In practical testing, core instruments include an electric thermostatic drying oven capable of precise temperature control and a high-precision analytical balance. With the advancement of industrial automation, instruments that can be installed on conveyor belts for real-time online monitoring of bauxite moisture based on electromagnetic waves or near-infrared principles have also been widely adopted, enabling immediate feedback and control of the production process.