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Objective:To study the influencing factors of osteoporosis in aged people, According to their physical conditions and physical exercise to analyze the protective and risk factors.To improve the prevention of osteoporosis in the old, Strengthen self protection, reduce fall and improve the health level and life quality of the old.Method:From February to May 2015, 150 cases of bone mineral density in Yingyuan Hospital of Shanghai Jiading District were selected as the research objects.Using ultrasonic bone mineral density meter to examine the bone mineral density of ankle joint.Recording the sex, age, height, weight, body mass index(BMI) , blood pressure, exercise and other baseline conditions, so as to clear whether there was osteoporosis; According to the osteoporosis conditions 150 cases were divided into three groups:Osteoporosis, low bone mineral density and normal group.T test or chi square test was used to compare the baseline conditions of three groups.Logistic regression analysis was used to analyze the factors that may affect the osteoporosis and the correlation between osteoporosis and osteoporosis.