Raffinose is the best-known trisaccharide composed of galactose, fructose, and glucose, widely distributed in most plants. It is also known as melitose, melitriose and gossypose. Raffinose can pass undigested through the stomach and the intestine. Raffinose is the excellent nutrition source and generation factor of Bacillus bifidus and other beneficial bacteria. It can improve the defecation function and digestion function and promote the body absorption of calcium, thereby enhance the human immunity and take effect on disease precaution and anti-aging. Raffinose is also the key component of the conservation transportation liquid for human or animal organs transplantation, and the synergist of prolonging the survival time of viable organism.