Amino acids are of great importance in the fields such as food or medicine industry, agriculture and daily chemical industry. Especially, With the greatly increasing requirement of the amino acids in the production of anticancer drugs, infusion preparation, and aspartame, it is very necessary to develop amino-acid producing strains by bioengineering method. The development of ferment method for amino acids production was reviewed and many strategies such as recombinant DNA technique and site-directed mutati...