I. Introduction
According to the World Health Organization in the national assessment report on aging and health in China, falls are one of the leading causes of disability, incapacity, and death in the elderly. 30% of older adults aged 65 years and older fall one or more times per year, and the probability of elderly falls increases with age, with those aged 80 years and older having as much as a 50% chance of falling each year [1]. With the deepening of aging in China, solving the problem of elderly falls has become particularly urgent. To address the problem of elderly falls, there are many timely post-fall detection studies, but the post-fall detection studies are based on the situation after the fall has already occurred. At this time, the harm to older people has already happened. Detecting whether or not the fall can only reduce the subsequent damage suffered by older people but it cannot avoid the impact of the fall itself. It is essential to anticipate and take preventive mees to minimize the harm caused by falls.