用ＥＳＲ的方法检测了中药复方“肺瘤平膏”水溶液对酶和非酶体系中产生的活性氧自由基的清除作用，“肺瘤平膏”水溶液能较强地清除羟自由基（·ＯＨ）与超氧阴离子，药液的浓度越高，其清除能力越强。加热可以提高药液的能力，透析后的药液显示出了最好的清除效应，说明小分子物质在清除活性氧自由基的过程中可能起着非常重要的作用。本研究试图从自由基理论的角度说明具有扶正抗癌中药复方的部分作用机理。 ESR method was used to detect the scavenging of active oxygen free radicals produced in the enzymatic and non-enzymatic systems by the aqueous solution of “Fungoma Ping Ointment”. The “Fungoma Ping Ointment” aqueous solution can strongly remove hydroxyl radicals (·OH ) With superoxide anion, the higher the concentration of the liquid, the stronger its scavenging ability. Heating can improve the liquid’s ability, and the liquid after dialysis shows the best clearing effect, indicating that small molecules may play a very important role in the removal of reactive oxygen radicals. This study attempts to illustrate some of the mechanisms of action of Fuzheng anti-cancer Chinese herbal compound from the perspective of free radical theory.