Alzheimer’s disease is a degenerative disease of the central nervous system with insidious onset and continuous progressive development. The main manifestations are memory loss, cognitive decline and psychiatric symptoms that gradually affect daily life and social functioning. It is generally believed that Alzheimer’s disease develops in response to multiple factors, including biological and psychosocial factors. There are many known risk factors for the onset of Alzheimer’s disease, including age, family history, low literacy, poor economic status, living alone, low social support, smoking, dietary factors, reduced estrogen levels in women, history of head trauma, excessive aluminum ion intake, hyperglycemia, hyperhomocysteinemia, dyslipidemia, etc. To prevent Alzheimer’s disease, we should start from avoiding or correcting risk factors, and strengthen prevention from psychological, lifestyle, diet and nutrition and other internal and external environmental factors. 1.Maintain a good state of mind, pay attention to the regulation of emotions, enrich spiritual life, and ensure the balance of psychological and mental state. 2, adhere to a healthy lifestyle, develop good habits, work and rest on time, regular life, quit smoking and alcohol; properly strengthen physical exercise, combining work and rest. Develop the habit of using your brain and hands diligently, actively learn new skills and be brave to accept new things. 3, a healthy and balanced diet, a diversified diet, more vegetables, legumes, fruits and whole grains, it is recommended to consume foods rich in L-arginine and less methionine, such as various nuts, black sesame, black beans, oats, etc. Folic acid, vitamins B6 and B12 can promote homocysteine metabolism and prevent hyperhomocysteinemia. Chicken, animal liver, potatoes, sunflower seeds, pears, bananas, beef, pork, eggs, milk, spinach, milk, tomatoes and other foods are rich in these nutrients. It is advisable to eat a diet with less salt, less sugar and less oil, and reduce the intake of saturated and trans fats, such as dairy products, meat, coconut oil, palm oil, pastries and fried foods. Avoid using aluminum tableware such as aluminum pots and pans, and eating aluminum-containing foods such as doughnuts with aluminum fluffing agents. 4. Prevent traumatic brain injury, actively prevent and treat risk factors such as diabetes, obesity, hyperlipidemia, hyperhomocysteinemia, etc., and require long-term drug intervention if necessary; 5. Early diagnosis and early treatment is the key to Alzheimer’s prevention and treatment, and early screening should be conducted for those who are over 60 years old and have risk factors, especially those who already have early symptoms such as memory loss, behavioral changes and mood changes. Although the incidence of Alzheimer’s disease increases with age, the elderly can effectively prevent their mental decline through scientific diet, exercise and normal socialization, and at the same time improve their awareness of the disease, early diagnosis and early intervention, Alzheimer’s disease can slow down its progress and reduce the chance of occurrence.