Abstract： Objective To explore the effect of shengmai injection (a Chinese herb preparation made from radix astragali and radix rehmanniae) on restoration of spontaneous circulation (ROSC) and hemodynamics in the early stage of resuscitation (CPR) in animal models of cardiac arrest, providing adjuvant support to stabilize the circulation for the facilitation of follow-up study in the resuscitated animal. Method A total of 30 rabbits were randomly(random number) divided into two groups, shengmai group and saline group, ( n = 15 in each group).Asphyxia method was used to establish animal models of cardiac arrest. In the shengmai group, 2 mL/kg shengmai injection was given immediately just after initiation of CPR and the same dose of shengmai injectio was given once again 10 minutes after ROSC. In the saline group, saline was administered in the same volume and at the same given time instead of shengmai injectio. The duration of cardiac arrest of rabbits, and the lengths of time consumed for ROSC and for resume of spontaneous respiration after CPR as well as the rate of ROSC obtained and 6-hours survival rate after CPR were documented. The changes of hemodynamics including LVSP, + dp/dtmax,- dp/dtmax, LVEDP were recorded before asphyxia,just after the emergence of ROSC and 30 min,60 min, and 120 min after ROSC. Results There were no significant differences in duration of cardiac arrest, length of time consumed for the resume of spontaneous respiration, rate of ROSC obtained and 6-hours survival rate between two groups (P ＞ 0.05), but the ROSC emerged sooner in shengmai group. The LVSP, + dp/dtmax and- dp/dtmaxsignificantly lower 30 min, 60 min and 120 min after ROSC then those before asphyxia in both groups, but LVEDP increased after ROSC (P ＜0.05). At the corresponding intervals after ROSC, the values of LVSP, + dp/dtmaxand - dp/dtmax in the shengmai group were higher than those in the saline group, and the values of LVEDP in the shengmai group were lower than those in the saline group ( P ＜ 0. 05). Conclusions Shengmai injectio used in rabbits with cardiac arrest can shorten the time consumed for ROSC after CPR, improve cardiac diastolic and systolic function after R OSC, stabilizing the hemodynamics after resuscitation.