Ancient healers also documented the diseases caused by the imbalance of intestinal ecology and invented the production method of golden juice and jade liquid to prepare for the urgent need, which was still being advocated until the 1960s. With the deepening of biotechnology and physiological science research, significant progress has been made in the study of gastrointestinal microbial ecology and its function. In recent years, the research on the impact of oligosaccharides on the intestinal microecology has made breakthrough progress, and it is considered to be one of the effective methods of green treatment of chronic constipation. It is believed that oligosaccharides can improve the micro-ecological environment in the human body, which is conducive to the proliferation of bifidobacteria and other beneficial bacteria, metabolized to produce organic acids to reduce the pH value of the intestines, inhibit the growth of Salmonella and spoilage bacteria in the intestines, regulate the function of the gastrointestinal tract, inhibit intestinal spoilage substances, change the stool properties, prevent and treat constipation, and increase the synthesis of vitamins to improve the immune function of the human body. Oligosaccharides are the product of several monosaccharides linked together. Because of the low degree of polymerization (usually defined as no more than 10 monosaccharides, some scholars believe that no more than 6), so it is called “oligosaccharides”. Oligosaccharides are commonly found in nature, and the main oligosaccharides in food are oligomeric isomaltose, oligofructose, oligosaccharides, oligosaccharides, oligogalactose, soybean oligosaccharides, and crustal oligosaccharides, etc. Many of the fruits and vegetables we usually eat have oligosaccharides in them. Many of the fruits and vegetables we usually eat contain oligosaccharides, such as beans, potatoes, sugar beets, some labiatae and gentian plant roots and starch. Often the term oligosaccharides is used to refer to those that cannot be digested or absorbed. Therefore, in terms of “nutritional value”, they are similar to dietary fiber, because they are not digested and absorbed, these oligosaccharides can pass through the stomach and small intestine intact to the large intestine, and therefore basically do not increase blood glucose and blood lipids, but also have a laxative effect. Oligosaccharides are widely used as a food ingredient in dairy products, lactobacillus beverages, bifidobacteria yogurts, cereals and health foods, especially in foods for infants, young children and the elderly. In the health food series, there are also oral liquids made from oligosaccharides alone, which are directly used to regulate intestinal flora, laxative, blood lipid regulation and immunity regulation.