Abstract:Alginate oligosaccharides （AOS）are a class of oligosaccharide produced by enzymatic degradation of alginate，producing low molecular weight oligosaccharides with strong solubility and good hygroscopic and moisturizing performance.AOS also has a variety of biological activities，including antioxidant，antiinflammatory，antibacterial，antihypertensive，immune regulation，gut microbiota regulation，and other biological activities.Thus，AOS has great potential for application in the fields of food，cosmetics，and pharmaceuticals.This review focused on research progress into the functional properties of AOS，and provided a theoretical basis and research ideas for development of related products.