Abstract:As a natural polysaccharide，pectin has been widely utilized in beverages，yogurt，meat products，and other food items. In recent years，advancements in pectin extraction and characterization technologies，coupled with the growing interest in its functional activities，have made the mechanisms of pectin bioactivity and its structure-effect relationships achieve significant research areas. The structural characteristics of pectin were introduced，and the effects of different sources and extraction conditions on its structure were analyzed.The relationship between pectin structure and its bioactivities，including immunomodulatory，anti-inflammatory，anticancer，antioxidant，and hypoglycemic properties was explored，so as to provide scientific insights for the nutritive and high-value development and utilization of pectin.