Dementia is a syndrome of acquired, persistent functional impairment due to brain dysfunction, with a variety of higher cortical dysfunctions involving reductions in memory, language, thinking, orientation, comprehension, computation, learning ability, speech, and judgment, and may be accompanied by abnormalities in mental behavior, diminished emotional control, and personality changes. The incidence and prevalence of dementia increases with age. According to statistics, the prevalence of dementia in the elderly over 60 years old is about 1-5%, and the prevalence of dementia in the elderly over 85 years old is about 40%. With the aging of the global population, the prevalence of this disease will increase rapidly, China is a large country with 1.3 billion people, and the elderly population accounts for 10% of the total population, which is about 130 million elderly people. In 2005, there were 5 million dementia patients in China; by 2020, the number will reach 10 million, and by 2040, it will reach 22.5 million. The long duration of dementia and the high cost of treatment bring a huge burden to the patient’s family and society. Ten danger signs of dementia: 1. Memory loss, affecting daily living activities, such as: frying vegetables put salt twice, forget to turn off the gas after cooking 2. Difficulty in dealing with familiar things, such as: difficult to perform daily chores: don’t know the order of dressing, cooking steps 3. Difficulty in verbal expression, such as: forgetting simple words, words or sentences that people can not understand 4. (4) Increasing confusion about time, place and people, e.g., not remembering what day of the week it is, what day of the week it is, and what province they are in (5) Decreasing judgment, e.g., wearing a cotton jacket in the hot sun but a thin coat in the cold (6) Decreasing comprehension or the ability to organize things in a rational way, e.g., not being able to keep up with the conversations of other people, or not being able to pay all kinds of bills on time (7) Often placing things in an inappropriate place, e.g., placing an iron in the washing machine (8) Emotional instability and behavioral changes from before Unstable performance and abnormal behavior, such as: rapid rise and fall of mood, become temperamental 9, personality changes, such as: can become suspicious, indifferent, anxious or rude, etc. 10, lose the initiative to do things, such as: spend time, no interest in the previous hobbies.