Xanthan Gum, which is mainly made from starch, is a high molecular weight polysaccharide produced by fermentation with Xanthomonas Campestris under the conditions of special nutrient medium, pH, O2-supply and temperature, then purified, dried and milled into white-like or light-yellow free-flowing powder. The main compositions of Xanthan Gum are D-glucopyranose glucan,D-mannose and D-Glucuronic acid. X-ray determining indicates that Xanthan Gum has a antiparallel double helices conformation, on which its special properties of water solution base.