Mildly impaired cerebrovascular function is considered to be associated with cerebral atherosclerosis, degenerative diseases and other causes. 1. Cerebral arteriosclerosis: for example, hypertension, the continuous increase of pressure value of flowing blood on the blood vessel wall will cause chronic damage to the cerebral blood vessels; hyperlipidemia, which will lead to lipid precipitation in the blood vessel wall, causing atherosclerosis and damaging the cerebral vascular function. 2. Degenerative diseases: such as cerebrovascular amyloidosis, β-amyloid deposition, impairing cerebrovascular function. 3. Other: endocrine diseases, systemic diseases, blood diseases, such as vasculitis, systemic lupus erythematosus, etc. can cause damage to cerebral blood vessels as well as systemic blood vessels. Mildly impaired cerebrovascular function should be taken seriously, and intervention and treatment should be carried out to prevent the condition from worsening after the cause of the disease is identified.