Asymptomatic cerebral infarction refers to the existence of evidence of cerebral infarction, but no obvious clinical manifestations, mostly detected through imaging tests. Strictly speaking, asymptomatic only means that no obvious symptoms have been found, and patients often have atypical symptoms, usually the more clinically concerned symptoms are numbness of the limbs, unfavorable speech, dizziness and headache. However, lacunar infarction does not cause limb motor sensory function, most patients affect the function of the higher cortex, resulting in memory loss, decreased reaction ability, emotional disorders, etc. At present, the potential function of this area has not yet been found in the clinic, which is also known as non-functional area.