Seaweed polysaccharides are a type of natural high-molecular active substances extracted and purified from seaweed. They are formed from different monosaccharide units through glucosidic bonds,with the advantages of high viscosity,good gel property,environmental-friendly and low cost. In this review,we focus on the progress of the application of seaweed polysaccharides in the fields including food,medicine,tissue engineering and environment engineering,where seaweed polysaccharides are used as food additives,edible coating materials,drug-release materials,medical dressing,tissue scaffolds and environmental adsorption materials. Introducing special properties,such as targeting,electrical conductivity and thermosensitivity,and designing bionic controllable micro/nanostructures to fabricate and develop multi-functional,intelligent seaweed polysaccharides would be the research hotspot in the future. Seaweed polysaccharides are a type of natural high-molecular actives extracted and purified from seaweed. They are formed from different monosaccharide units through glucosidic bonds, with the advantages of high viscosity, good gel property, environmental-friendly and low cost. , we focus on the progress of the application of seaweed polysaccharides in the fields including food, medicine, tissue engineering and environment engineering, where seaweed polysaccharides are used as food additives, edible coating materials, drug-release materials, medical dressing, tissue scaffolds and environmental bonding materials. Such as targeting, electrical conductivity and thermosensitivity, and designing designing bionic controllable micro / nanostructures to fabricate and develop multi-functional, intelligent seaweed polysaccharides would be the research hotspot in the future.