Due to the improvement of the level of medical and health prevention worldwide, the mortality rate of infectious diseases has dropped significantly, the average life expectancy of people has increased, the number of old people has gradually increased, and the proportion of old people in the total population has also gradually increased, forming an aging population. In 1990, Beijing entered into an elderly society, and in terms of the degree of aging, all 18 districts and counties in Beijing have basically entered into the ranks of the aging population. With the aging of the population, the absolute number of people suffering from dementia will continue to increase, which will bring a greater social burden and impact, so early identification and prevention of dementia is not only a medical problem, but also a major social issue.