Alginate oligosaccharides (AOS) are carbohydrates composed of 2-10 monosaccharides connected by glycosidic bonds. Oligosaccharides play an important role in the basic life process of organisms and the occurrence and development of the organism. The development of functional oligosaccharides has become an important direction in international biotechnology. Seaweed oligosaccharides features low molecular weight, strong water solubility, high stability, high safety, and non-toxic properties. Low molecular weight seaweed oligosaccharides also have many biological activities and have broad development prospects in agriculture and other fields. 1. As a kind of endogenous plant-like oligosaccharides, alginate oligosaccharides play the role of signal molecules in plant stress resistance and can promote plant growth. 2. Enhance plant resistance, drought resistance 3. used as a stabilizer for pesticides, as a wormicide, fertilizer forming agent, regulator, etc