There are two main categories of psychiatric disorders in old age: the first category is functional psychiatric disorders, which mainly include schizophrenia, affective psychosis, neurosis, etc. These disorders can occur in young adulthood and then continue into old age. These disorders can occur in young adulthood and then continue into old age, but they are relatively rare in old age; the other type of mental illness is called organic mental disorders, which are more common in old age and mainly manifest in various types of dementia, which is caused by damage to brain function caused by various physical diseases. This type of disease is more common in the elderly and is mainly characterized by reduced intelligence, decreased ability to live, emotional instability or depression, which brings great inconvenience to the family and the patient himself, because the ability to live is decreasing, the quality of life of the elderly is greatly affected, and the family also brings a great burden of care.