Objective To observe the influence of Huangqi Xianxiong Capsule（Capsule containing Radix Astragali seu Hedysari for heart diseases）with differently-processed Banxia（Rhizome Pinelliae）in it on the blood pressure of elderly isolated systolic hypertension（EISH）.Methods The 180 EISH patients were randomized into Sheng-Banxia（unprocessed pinellia tuber）group

Qing-Banxia（alum processed pinellia）group

and Fa-Banxia（processed pinellia tuber）group with 60 in each.Three groups were administered Perindopril Tablets 4mg

once a day

and Huangqi Xianxiong Capsule containing differently processed Banxia（Rhizome Pinelliae）

5 capsules each time

3 times a day

20 weeks as one course of treatment.The changes of systolic blood pressure（SBP）

diastolic blood pressure（DBP）

and pulse pressure（PP）of all groups were observed.Results After treatment

the decrease of SBP and PP of the Sheng-Banxia group was more than that of the Qing-Banxia group and the Fa-Banxia group

while the decrease of DBP was less than that of Qing-Banxia group and Fa-Banxia group（P<0.01）.Compared with the Fa-Banxia group

the decrease of SBP

DBP

and PP of the Qing-Banxia group was all statistically significant（P<0.05）.Conclusion The effect of Huangqi Xianxiong Capsule containing Sheng-Banxia is the best in lowering the systolic pressure and reducing the pulse pressure of EISH with the minimum effect in lowering the diastolic pressure.