Chronic cerebral insufficiency mainly refers to mild cerebral dysfunction caused by blood supply to the brain that is lower than the physiological demand for various reasons. Diagnostic criteria 1. Age over 60 years old (can be relaxed to 45 years old or above). 2.History of factors causing cerebral atherosclerosis such as hypertension, diabetes mellitus, dyslipidemia (risk factors); history of chronic heart failure or long-term hypotension (cerebral perfusion deficiency); or coronary artery disease, peripheral artery (ophthalmic artery, temporal artery, radial artery, etc.) sclerosis; or vascular murmur of cerebral perfusion artery can be heard (arteriosclerosis or vascular stenosis collateral evidence). 3, there are chronic brain dysfunction symptoms such as dizziness, dizziness, head swelling and pain, memory loss (obvious with near memory), slow reaction, inattention, emotional instability, reduced work ability, sleep disorders, etc. The above symptoms are subjective feeling with fluctuation, sometimes light and sometimes heavy; the degree is mild (does not affect the work) or light to moderate (heavy self-conscious symptoms, affecting the work, low efficiency), for more than 2 months. 4. With or without mild positive neurological signs Such as active tendon reflex, positive palmar reflex, sucking reflex, Rossolimo’s sign, and non-systemic. 5. Laboratory examination (1) TCD or (and) color ultrasound examination with cerebral perfusion artery stenosis or occlusion changes; (2) CT or (and) MRI examination without or with luminal infarction or (and) mild white matter demyelination changes without clear corresponding signs; (3) DSA, CTA, MRA examination with cerebral perfusion artery stenosis or occlusion or small arteriosclerotic changes; (4) functional brain imaging examination to confirm the presence of cerebral (4) Functional brain imaging confirms the presence of low cerebral blood flow. (6) Treatment with cerebral circulation improving agents and cerebral metabolic agents is effective. (7) Exclude other diseases that cause the above symptoms.