The examination of lacunar cerebral infarction includes: 1. General examination: including blood glucose, blood lipid, blood rheology, plasma plasminogen time, prothrombinogen kinase time; 2. Other examinations: for example, electrocardiogram, blood pressure monitoring, electroencephalogram, cerebral hemorheogram, Doppler and so on. The EEG of patients with vascular dementia basically shows diffuse low-amplitude slow wave; cerebral hemorheology is mainly due to the decrease in the elasticity of blood vessel wall and blood flow, and the rate of abnormality is very high; transcranial Doppler ultrasonography not only can accurately determine the degree of stenosis of blood vessels, but also can dynamically detect the size, number and flow of blood clots.