OBJECTIVETo observe the effect of Huancongdan (HCD) capsule on senile vascular dementia (SVD).METHODSSeventy two cases of SVD were divided randomly into two groups. The HCD group (37 cases) were treated with HCD and the control group (35 cases) treated with Hydergine.RESULTSAfter 2 months of treatment, the clinical symptoms, hyponeural defect, self-care capability and abnormal ratio of whole blood viscosity to plasma viscosity in HCD group were significantly different as compared with before treatment (P < 0.05).CONCLUSIONThe effect of HCD for treatment of SVD was affirmative.