Starch is renewable carbohydrate only inferior to cellulose. It has kinds of the advantages such as with low price, degradation of safety, and is noted by people for long-term attention. Slowly digestible starch has a very important effect on the prevention and treatment of some diseases and it provides bright application prospect in health field. As a kind of modified starch, it can be used as a new food for diabetics. In this paper, we briefly reviewed the progress of slowly digestible starch, and summarized preparation methods, test methods and physiological functions. In addition, the long...