L-alanine is one of more than 20 amino acids that make up human protein. AHB has successfully broken through the bottleneck of anaerobic fermentation technology and successfully achieved the large-scale production of L-alanine by microbial anaerobic fermentation for the first time in the world. Compared with the chemical route, it has the advantages of short process flow and low carbon emissions, and its technology is internationally leading.And fermentation is carried out using a simple inorganic salt culture medium plus glucose, which avoids carbon dioxide emissions, has significant economic and environmental benefits, and promotes the promotion and application of the new environmentally friendly agent methyl glycine diacetic acid (MGDA).