Objective\ To determine the component sugars,the molecu lar weight,the forms of linkage and scavenging action to hydroxyl free radical o f GBL(Ginkgo biloba leaf) polysaccharide.Methods\ The co mponent sugar was determined by gas chromatography analysis.Its molecular weight was measured by gel filtration.The scavenging action to hydroxyl free radical w as tested by Fenton reaction contrasting with special eliminations for hydroxyl free radicals,for example, mannitol,benzoic acid.Results\ The polysa c char...