Abstract: Dietary fiber has important physiological functions, such as regulating gastrointestinal tract and preventing chronic diseases, known as the seventh-larges nutrient, but the functional characteristics of different dietary fiber are different.Therefore, the research and development of highly active dietary fiber and its application in food processing and as health care (functional) food have become a hot topic in the current food industry.Soybean dregs is a by-product of soybean processing, rich in dietary fiber, but mainly insoluble dietary fiber (IDF), soluble dietary fiber content is extremely low, resulting in poor taste of bean dregs, the application in food processing is limited. This paper reviewed the functional characteristics of different dietary fiber and compared the working principle and the effect on SDF in dietary fiber of different modification methods, it provides support for the modification of IDF from different sources and the processing and utilization of dietary fiber from bean dregs.