Extraction and antioxidant activity of polysaccharide from Glycyrrhiza Uralcnsis in Ningxia were studied.The polysaccharide were extracted by aqueous extraction and alcohol precipitation from roots of Glycyrrhiza uralcnsis.Vc was used as control,The antioxidant capacity of the licorice polysaccharide was evaluated by spectrophotometry on its ability of scavenging hydroxyl radical(·OH),superoxide anion radical(O-2·) and 1,1-diphenyl-2-picrylhydrazy radical(DPPH·),total reducing power and the antioxidant capability on oils.Results showed that the scavenging effects of licorice polysaccharide with purity of 88.03% on ·OH,O-2· and DPPH· were significant,the polysaccharide also had a strong total reducing power and the antioxidant capability on oils.All these activities were concentration dependent.