Abstract:Sources of material of bioactive polysaccharides are widespread.Bioactive polysaccharides have all kinds of biological activities such as immunoregulation，antineoplastic，antiviral，antioxidant，antidiabetics，and its structure is closely connected with biological activities.Now it is one of studying heat in the field of food science and pharmacology，and it is a very important health factor in foods.In order to provide theoretical basis on further development and utilization of bioactive polysaccharide，the main source of bioactive polysaccharide，bioactivity，main mechanism of action，structure-activity relationships and developmental trend were discussed in this paper.