GB/T 20380.2-2006 stipulates the use of atomic absorption spectroscopy (AAS) to measure the mercury content in starch and its products. It first processes the starch sample so that the mercury element can be detected. Mercury atomization is made by the instrument to measure its absorption of specific wavelengths of light, and then the mercury content is calculated according to the standard Linear dispersion. In the determination, every link from sample preparation, instrument debugging to data processing has strict regulations. This standard is of great significance to ensure the mass safety of starch foods. It can accurately monitor mercury pollution and is widely used in the production and Quality control of the food industry to protect consumer health.