Fifty cases of mild - moderate cerebrovascular dementia selected by referring to the diagnositic criterion DSM- I -R for cerebrovascular dementia （VaD） established by America Society of Psychoneurology issued by WHO were randomly divided into Shen Tong Capsule treatment group （30 cases） and hydergine treatment group （20 cases）. Modified Mental State Examination （MMSE） and Blessed Behavior Scale （BBS） were used to calculate changes of marks before and after treatment for assessment of therapeutic effects. Results show that Shen Tong Capsule has therapeutic effect on key symptoms and clinical behaviour of mild - moderate disturbance of intelligence

with the total effective rate of 86. 67%. Differences of accumulated marks in both MMSE and BBS before and after treatment in the treatment group are superior to those of the control group respectively.