Objective To explore the regulatory effect of Tianma Xiongling Zhixuan Tablets(TXZT) on angiotensin converting enzyme(ACE)2/angiotensin(Ang,1-7)/Mas axis in spontaneously hypertensive rats(SHR),and to explore its mechanism of prevention and treatment of hypertension.Methods Fifty SHR rats were randomly divided into the model group,the Irbesartan group,the high-,medium-,and low dose TXZT groups,and another 10 WKY rats were taken as normal group.Rats in the Irbesartan group were administered with irbesartan(27 mg/kg per day);the rats in high-,med...