Resistant dextrin is a kind of low-calorie dextran obtained from starch by heating decomposition in acid condition. It belongs to low molecular water-soluble dietary fiber. Dietary fiber is an indispensable material to maintain human health. Soluble dietary fiber affects food intake, it can reduce weight while controlling energy intake. Resistant dextrin also has good heat resistance, good acid resistance, and good freezing resistance, it has a vast development prospects in the food industry.