Abstract:In order to study the basic physical and chemical properties of the polysaccharides from Pueraria，the raw material PS-D1，PS-D2 and PS-D3 were obtained from the samples obtained from the DEAE-52 cellulose column after defatted and deproteinized.The molecular weight distribution，the basic form of appearance，Congo red and anti-oxidation in vitro assays were studied.The results showed that：the molecular weight of the three components of the dispersion coefficient was relatively concentrated，respectively，1.4，1.9 and 1.4.The morphology of the surface was analyzed by SEM scanning，which was fibrous，patchy or debris，Congo red analysis showed that the polysaccharides without three helix structure，in aqueous solution was a random coil chain conformation.The antioxidant results showed that polysaccharide had a better DPPH radical scavenging ability and their half inhibition rate IC50values were 3.14，2.85 and 2.31 mg/mL，respectively.And they contained the ability of scavenging free radicals ABTS+，which PS-D3 equivalent antioxidant capacity（TEAC）was the best of 53.83 μmol Trolox/g sample.The study of the basic physical and chemical properties of the polysaccharide from the Pueraria provided the theoretical basis for the development and comprehensive utilization of the Pueraria.