Stevioside is a natural sweetener extracted from the composite herbage---stevia. It is a kind of good sweetener instead of cane sugar.The stevioside is a stable and non fermented substance with freshstatus for a long term and no metabolism, cumulation and poison inthe body, so its safety was passed inspection of internationalorganization FAO and WHO. .Its sweet degree is 200-300 times as much as cane sugar and thecalorie is 1/300 of cane sugar. The stevioside can reducebitterness and unsafe factors made by the saccharin and otherchemosynthesis sweeteners.