Saccharin is an artificial sweetener known as o-sulfonyl benzoyl imide. Commercially available saccharin is the saccharin sodium salt. Because saccharin does not dissolve easily in water, it is used to make saccharin sodium salt. The sweetness of saccharin sodium is 300~500 times higher than that of sucrose, and the sweetness threshold is 0.00048%. The residue of sweet taste is long and slightly bitter, and it can be used with sugar and glucose to weaken the bitter taste to some extent. Saccharin sodium soluble in water, in water solubility with temperature, increase rapidly, with the rising of the solubility of 99.8% in 20 ℃. The acid solution of saccharin sodium, which decomposes gradually after a long period of heating to form sulfonamide benzoic acid, weakens the sweetness. The usage amount shall not exceed 0.15g/kg in the standard of use.