A lot of carbohydrate products are now in industrial use . Modified starch must be the oldest one of the products . Starch hydrolyzates such as dextrose and maltose are useful sweet ener and high fructose corn syrup founded a big sweetener market. Sugar transferred oligosaccharides, coupling sugar and fructo-oligosaccharide have been established asnew physiological functional sugars which are good for health . Recently, many different kinds of sugars and sugar chains that exist widely in living cells have been shown to play an important role as bi ological signal substances . In this paper the usefulness of these carbohydrates is reviewed.