Stevia is a new natural sweetener extracted from the leaves of stevia which belongs to composite plants. It has unique properties of high sweetness and low calorie. The sweetness of it is ******0 times of cane sugar, but only 1/**0 calories of it. A large quantity of medical experiments shows that the stevia is no harm, no carcinogen, safe as food etc.... It can prevent people from hypertension, diabetes mellitus, obesity, heart diseases, tooth decay etc. and is an ideal can sugar substitute. It can be widely used in food, beverages, medicine, daily-used chemical, brew and cosmetics etc. and can save *0% of cost than can sugar. It is white or light yellow powder with properties of naural, good taste and no odor. It is a new source of sweetener with good potentials. It is approved by Ministry of Public Health and Ministry of Light Industry of China and the FDA of USA as a sweetener which has low calorie and similar taste as cane sugar. It is the third natural substitute of sugar with prtentials of development and health after can sugar and beet sugar. It is known as "the third source of sugar in the world".