Abstract: The free-radical-scavenging activity of different groups from terminalia chebula ritz were studied. The results showed that all extracts of terminalia chebula ritz and three chromatographically purified components had strong DPPH· scavenging effects. The methanol extract in 1 mg/mL showed that it had better free-radical-scavenging activity than that of TBHQ and its chromatographically purified component C showed the strongest activity among all samples. Its activity was slightly stronger than that of tea polyphenol, as 1.2 folds of TBHQ's. The activities of two chromatographically purified components from ethyl acetate extract were 1.6 and 1.1 folds as the original, respectively. By color test, UV and H1NMR all of the purified components were confirmed to be the derivatives of myrobalani-tannin or their hydrolyzed segments. The extracts of terminalia chebula ritz as free-radical-scavenging of tobacco provided an effective theoretical basis.