Abstract： Objective To study the effects of Shen-fuinjection onthe activity of β-adrenoreceptor in SD rats with cardiopulmonary resuscitation. Method The exprimerit was done at emergency medical lab of Shanghai Changzheng hospital.Cardiac arrest was induced thngh asphyxiation(succinylcholine)and ice-cold 0.5 mol/L KCI in rats,and resuscitation began at five minutes after cardiac orrest.In this experiment,seventy-two male SD rats were randomizly divided into 9 groups:control group(sham group),routine treatment(O.5 h,2 h,4 h,6 h) groups.and Shen-fu treatment(O.5 h,2 h,4 h,6 h),and each group had 8 rats.Rats of Shen-fh treatment groups were injected with shen-fu(20 mL/kg,20 mL/h)during CPR.3H-prazosln Wag used to determine the activity of β-adrenoreceptor in myocyte. The data of the statistic analysiswere presentedin the for mofmeaj14-standard(4-5)deviation.One-way ANOVA was used for muhig Toup comparison,and t-test for comprarison between two groups.Results[3-adrenoreeeptor reached peak at0.5 h after CPR(247.81±8.91)fmol/mg,reached the lowest level at 4 h(104.17 4-13.87)fmol/mg,and returned to the normal level at 6 h(178.53±10.42)fmol/mg.In the eady period.-adrenorecepter activity in control group[O.5 h:(259.91-4-18.09)finol/mJ was similar to that in Shenfu treatment groups(P>O.05).In the late phase,adrenoreeeptor activity in the Shen-fu treatment groups[2 h:(173.04±18.77)fmol/mg,4 h:(148.72±13.88)finoL/mg]was significantly hi#er than that in the control groups(P<0.05).Conclusiom After CPR, ceplor activity firstly rises and then declines,and Shenfu injection Call significantly increase adrenoreceptor activity of mrs in the later period after CPR.