Based on the function of nourishing blood and activating blood circulation,Naornaishu(NMS)composed of Rhizome Chuanxiong,Radix Salvice Miltiorrhizae,etc.has been used to treat cerebral arteriosclerosis and infarction.65 Patients with cerebral arteriosclerosis were treated with NMS for about two months and got a total effective rate of 98.5%.50 cases with eerebral infarction were also observed.It was shown that its effect on impro- ving myodynamies,alleviating aphasia,relieving dizziness and turning patholo- gic reflex negative was 86.4%,76.9%,100% and 38.0% respectively.No side effects were obser(?)ed during the period of more than two years of clinical applications.Therefore,NMS is regarded as an ideal medicine for preventing and treating cerebrovascular diseases.