Xanthan gum is a high molecular weight polysaccharide made from starch through fermentation, featuring unique molecular structure, complete physiochemical property and function, good thickening and suspending function and stability. Hence it has become the most advantageous biological gum both at home and abroad. As it is poison-free and odorless, it has been increasingly widely used as additives and stabilizers of foods, beverages, detergents, cosmetics and applied in such industries as oil drilling, chemical industry, tobacco and so on. Its high viscosity in particular has made it superior to any other gum. Its unique rheology and fine heat stability have received extensive praises of the food industry. It has been playing an indispensable role in the oil drilling and exploitation. This biological fermented product is playing a unique role in various industries for its incomparable characteristics.