Soybeans: belonging legume, is an annual herb, which is also known as soybean seeds. Is the world's most important legumes. Soybean originated in China, Chinese scholars tend to feel that the area of ??origin is the Yunnan-Guizhou Plateau. There are also many botanists considered by the origin of China's soybean derived Ussuri. Cultivation of soybeans are grown from wild soybeans through long-term directional selection, improved domestication made. Soy is rich in quality protein, unsaturated fatty acids, calcium and B vitamins in the diet of residents is an important source of high quality protein. Soy protein content of about 35% -40%, in addition to methionine, the other essential amino acid composition and proportion similar to the animal protein, and the lack of lysine-rich cereal proteins, cereal proteins is an oil processing complementary foods. Soybean fat content of about 15% -20%, of which 85% unsaturated fatty acids, linoleic acid up to 50%, and high digestibility, but also contain more phospholipids. Soybean carbohydrate content of about 25% -30%, half are dietary fiber, which raffinose and stachyose in the role of intestinal bacteria fermentation gas, can cause bloating. Soy is rich in phosphorus, iron, calcium, respectively, per 100g soy containing phosphorus 571mg, oil press, and calcium 367mg, significantly more than the grains due to soybean oil yield is relatively low, it is generally taken out of the oil used for leaching oil, China's general foreign oil producers adopt genetically modified soybean as raw material, because genetically modified soybean oil as high as 25% -35%.