γ-Aminobutyric acid (GABA) is a kind of non-protein amino acid in nature, It is an important inhibitory neurotransmitter of the mammals'central nervous system. It can be participate in cerebral circulation and influence on depressing blood-pressure, improve functions of brains, enhance memorial ability, and resiste anxiety and other biological functions. GABA is also a functional factor in medicine, food and can be found widely in natural environment. In this paper, a preliminary study of screening ...