In recent years,exopolysaccharides produced by food-grade bacteria has aroused great interest.worldwide.In addition to the biological effects on their producers themselves,bacterial exopolysaccharides are widely applied in the agricultural,food,pharmaceutic as well as chemical industries for their prominently biological activities and processing properties.In this paper,the roles of some bacterial exopolysaccharides in biofilm formation and their chemical structures and prospects for application are reviewed.Further investigation on bacterial exopolysaccharides is also suggested.