[Objective]The aim of this experiment was to optimize parameters of extracting polysaccharide in lotus leaf and study its antioxidation in order to provide technical references for extraction and utilization of polysaccharide in lotus leaf. [Method]Single factor experiment and orthogonal experiment were designed to optimize extracting technology for polysaccharide in lotus leaf from extraction time, extraction temperature, and material/liquid ratio to study the scavenging effects of polysaccharide on hydrox...