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As one of the main causes of accidental injury death,falls not only brings a lot of health problems,but also caused huge economic losses.And accidental falls are the main factors that endanger the health of elderly people in modern society.Timely and effective fall detection and alarm can reduce the risk of falls.Through the collection,research and analysis of the data of human behaviour,study the fall detection and prevention program to promote the standardization and scientific of prevention and treatment of falls.