Abstract: γ-polyglutamic acid is a biodegradable polymer which can be produced by microbial fermentation.γ-polyglutamic acid has a great variety of applications in food,cosmetics,medicine,agriculture and other fields for its properties of water-soluble,ion-adsorptive,biodegradable and nontoxic to human and environment.In this paper,the chemical constitution,properties,production and application of γ-polyglutamic acid are reviewed.