Stevia is a new type of natural sweetener extracted from the compositae herb stevia (or stevia leaf), and stevia has been used as an herb and as a sugar substitute in South America for hundreds of years. According to the data of international sweetener industry, stevia has been widely used in the production of food, beverage and flavoring in Asia, North America, South America and European Union. It has the characteristics of high sweetness and low heat energy. Its sweetness is 200-300 times of sucrose, and its calorific value is only 1/300 of sucrose. A large number of drug experiments have proved that stevia has no side effects, no carcinogen, and is safe to eat. Regular consumption can prevent hypertension, diabetes, obesity, heart disease, dental caries and other diseases. Stevia is an ideal sweetener that can replace sucrose. Stevia can be widely used in food, beverage, flavoring, brewing, medicine, daily chemical, brewing, cosmetics and other industries.