1, diligent use of the brain to prevent dementia. People often say: “the more you use your brain, the more spiritual”. There is a physiological decline of the brain in the elderly, once the brain cells are damaged, it is difficult to recover as before, so the elderly should consciously strengthen the exercise of brain function, do diligent brain, more observation and thinking. For example, insist on reading books and newspapers, writing, listening to radio, watching TV, playing chess, practicing sword, etc. every day. Daily 30 to 40 minutes of health ball exercise, finger movement is a benign stimulus to the brain, can improve the blood supply to the brain, so that the brain cells active. All these activities are beneficial to maintain the function of the brain. 2, out of the house, into the community. After entering old age, many elderly people have a sense of loneliness, some even closed doors, completely isolated from the outside world, which will accelerate the decline of brain function. Therefore, the elderly should get out of the house every day and enjoy nature; actively participate in various forms of social activities, gatherings of friends, and talk with people to discuss problems, in order to release the loneliness in their hearts; cultivate new interests, climb new goals, and maintain an optimistic mood is extremely important. All of these activities help to maintain and enhance brain function. 3, avoid all kinds of negative psychological stimulation. Clinical observation shows that all kinds of negative stimuli can aggravate the psychological burden of the elderly and promote the occurrence of dementia, therefore, the elderly should pay attention to adjust their mindset, think about things, do not over-consider, always keep a normal heart, so as to be able to resolve all kinds of bad psychological and mental stimuli. 4.Rational diet. Brain nerve cell activity requires sufficient protein, calories, lecithin, choline, vitamins, trace elements, etc.. For this reason, the first thing to do is to achieve a balanced diet, on the basis of which then pay attention to supplement a variety of necessary nutrients. For example, lean meat and fish can be supplemented with protein; egg yolk can be supplemented with lecithin and choline; fruits and vegetables can be supplemented with various vitamins, and if necessary, mixed preparations of vitamins and trace elements can be taken, such as Shiercon. 5.Antioxidant application. Scientific research shows that oxidative damage is a contributing factor to Alzheimer’s disease. Since the antioxidant capacity of the elderly is weakened, the timely addition of antioxidants (i.e. free radical scavengers) may slow down the development of the disease. It has been confirmed that vitamin C, E and beta carotene can scavenge free radicals in the body and prevent dementia, so carrots, tomatoes and cauliflower can be consumed. American scientists found that taking 2000 mg of vitamin E daily can reduce dementia symptoms. Secondly, brewing vinegar can provide oxygen for brain cells, and alcohol can delay the brain function decay. In addition, French experts on 3777 older people over 65 years of age for 3 years of follow-up, the results found that drinking 3 to 4 small glasses of red wine daily can reduce the incidence of Alzheimer’s disease by 75%, while the daily consumption of more than 50 ml of alcohol is harmful. 6, the use of drug conditioning. Some scholars did clinical trials and found that the incidence of Alzheimer’s disease was less than 3% in women who took estrogen, but higher than 8% in those who did not take estrogen, so it is believed that estrogen can delay the occurrence of Alzheimer’s disease, so older women can take it under the guidance of doctors. Chinese medicine believes that Alzheimer’s disease is mostly caused by the lack of kidney essence, brain emptiness, and the absence of the master, so prevention is based on replenishing qi and blood, tonifying the kidneys and strengthening the brain, such as using Chinese wolfberry, eucommia, rehmannia, ginseng, longan meat, jujube, etc., to take its role of benefiting the kidneys and fixing essence, nourishing the heart and increasing intelligence. 7, actively prevent and control other diseases. Research shows that hypertension, hyperlipidemia, arteriosclerosis, diabetes, cerebrovascular disease, chronic bronchitis and other diseases and brain decompensation and dementia have a close relationship, therefore, the elderly should usually prevent and monitor these diseases, once found, should be timely medical treatment, it is necessary to delay the occurrence of dementia in the elderly.