Objective: To observe oxygen-free-radical clearing activity and anti-lipid peroxidation of Shengyaling injection in vitro. Method: In-vitro oxygen free radical generation system (OFRGS) and lipid peroxidation induced by OFRGS in the supernatant fluid of mice heart tissue homogenate were used to evaluate the anti-oxidation activity of Shengyaling injection. Result:Shengyaling injection cleared superoxidase anion free radical induced by hypoxanthine-xanthine oxidase system and hydroxyl free radical induced by fenton reaction system, and inhibited mice heart tissue lipid peroxidation induced by FRGS at a dose-dependent manner. Conclusion:Shengyaling injection possesses an anti-oxidation effect.