Soybean oligosaccharide is a general term for soluble oligosaccharides in beans.Studies indicated that its chief component-stachyose and raffinose had many prominent physiological activities such as antitumor properties,improving gastrointestinal performance,adjusting the lipid of blood and so on,causing more and more scholars' great interests on this filed.More and more studies on stachyose and raffinose in beans hade not only provided atheoretical basis for the designation of new functional soybean products,but also showed desirable reference for people's daily diet.Therefore,this paper reviewed the research progress of thephysiological functions especially the flatulent phenomenon of stachyose and raffinose in recent years.