All dementias related to cerebrovascular factors are collectively referred to as cerebrovascular dementia (vascular dementia). First of all, it must be pointed out that dementia actually refers to a syndrome in which brain function declines, especially the overall decline of intelligence-related functions, and the decline reaches a certain degree. It usually includes a series of symptoms and signs such as memory, cognition, emotions and behaviors, and lasts for several months or more than half a year. Vascular factors mainly refer to the blood vessels in the brain, namely the two major systems of carotid arteries and vertebral basilar arteries. It can be lesions of these blood vessels themselves, or lesions of large extracranial blood vessels and the heart, which indirectly affect the blood vessels in the brain, resulting in insufficient blood supply and ischemic and hypoxic changes in brain tissue, and ultimately causing a comprehensive decline in brain function.