Abstract: To study whether the three proprietary forms——Shengmai injection,Shengmai drink,Shengmai capsule,which can be directly used in clinic,have  the effect of  resistance on oxygen free radical (hydrogen radical ·OH and superoxide anion  radical   O－2·,whether there are any differences between the three.Mensurate ·OH with the oxidation of phenathroline -Fe2+，mensurate  O－2·  with improved pyrogallol auto-oxidation.Results shows that  all of the three forms of Shengmai power are of the ability of  removing  ·OH  and  O－2·;there are not significant differences between the three (P>0.05),but there are significant differences when compared with comparison tube (P<0.01).  

Key words: Shengmai injection, Shengmai drink, Shengmai capsule, oxygen free radicals