For investigating the anti-oxidation effect of bavachin flavonoid, SOD activity and immune organ exponent of mouse were tested with malytea scurfpea fruit decoction and bavachin flavonoid extract fluid being used. The results showed that bavachin flavonoid could increase the activity of SOD in liver by 14.84% and the immune organ exponent of mouse. So bavachin flavonoid has the function of anti-oxidation.