In this paper, the effects of different varieties on the antioxidant activities of crude flavonoids from ginger were mainly compared and analyzed. Using the fengtou tender and old ginger and yellow craw old ginger as the raw materials, the effects of three different flavonoids from ginger on the scavenging effect of superoxide anion free radicals, hydroxyl radical and hydrogen peroxide as well as the protective effect of the DNA-damage were determined by the chemiluminescence methods. The results showed tha...