Because of its unique properties, xanthan gum has been widely used in more than a dozen fields, such as food, petroleum, medicine, daily chemical industry, etc. Its high degree of commercialization and wide range of application make any other microbial polysaccharide unmatched. 1, food: many foods are added to Xanthan gum as a stabilizer, emulsifier, suspension agent, thickening agent and processing aid. Xanthan gum can control the rheology, structure, flavor and appearance of the product, and its false plasticity can ensure good taste, so it is widely used in salad dressing, bread, dairy products, frozen food, drinks, condiments, brewing, candy, pastry, soup and canned food. In recent years, people in more developed countries often worry that the calorific value of food is too high and will make them fat. Xanthan gum can not be directly degraded by the human body to dispel people's concerns. In addition, it was reported in that xanthan gum was the most effective anticancer agent among eleven food additives tested in comparison. 2, daily chemical industry: Xanthan gum molecules contain a large number of hydrophilic groups, is a good surface active substance, and has antioxidant, prevent skin aging and other effects, therefore, almost the vast majority of high-grade cosmetics are xanthan gum as its main functional components. In addition, xanthan gum can also be used as a substance of toothpaste thickening and shaping, reducing the surface wear of teeth. 3. Medical aspects: Xanthan gum is a functional component in microcapsule drug materials, which is currently hot in the world, and plays an important role in controlling the slow release of drugs. Due to its strong hydrophilicity and water retention, there are many specific medical applications, such as the formation of a dense water film, thus avoiding skin infection; Relieve thirst after radiotherapy. In addition, Li Xin and Xu Lei have written that xanthan gum itself can significantly enhance the humoral immune function of mice. 4, industrial and agricultural applications: in the petroleum industry, due to its strong pseudoplasticity, low concentration of xanthan gum (0.5%) aqueous solution can maintain the viscosity of drilling fluid and control its rheological properties, so in the high-speed rotation of the bit site viscosity is very small, save power; High viscosity is maintained in the relatively static borehole area to prevent wall collapse. And because of its excellent salt resistance and heat resistance, it is widely used in Marine, high salt zone and other special environment drilling, and can be used as oil recovery agent, reduce dead oil areas, improve oil recovery rate.