[Clinical research of effect of Yishen Yangnao capsule on vascular dementia].

Objective: To find a good way to diagnose VD, value the effect of Yishen Yangnao capsule on VD and try to find some rules of changes in Chinese medicine syndromes.

Method: Patients were randomly divided into treating group and western medicine comparison group. It's the phase III clinical research of Rishen Yangnao capsule curing VD, judging the validity and security of it, using dukexi slice as comparison drug.