1.Adjustment of lifestyle (1) balanced diet rich in calcium, low salt and moderate protein (2) appropriate outdoor activities and sunshine (3) avoid smoking, alcohol abuse, caution in the use of drugs that affect bone metabolism (4) take various measures to prevent falls (5) strengthen their own and environmental protection measures 2.Bone health basic supplements (1) calcium: China’s Nutrition Association has set the recommended daily intake of calcium for adults 800mg ( elemental calcium) is the appropriate dose to obtain the ideal bone peak and maintain bone health. If the calcium supply in the diet is insufficient, calcium supplements can be used. The current dietary nutrition survey shows that the average daily calcium intake of the elderly in China is about 400mg from the diet, so the average daily calcium supplement should be 500~600mg. (2) Vitamin D: Vitamin D deficiency can be reflected by testing the serum 25(OH)D level, <30ng/ml is deficiency, <10ng/ml is deficiency. 10ng/ml is deficiency. Calcium enters the body and needs the help of active vitamin D to be absorbed. In the elderly, active vitamin D synthesis decreases, so even if calcium supplements are taken, they are not well absorbed, or "calcium tablets are not absorbed through the intestinal tract for a day". Regular vitamin D is not active and cannot play a therapeutic role. Active vitamin D promotes the absorption of calcium in the small intestine and the mineralization of bone. Therefore, active vitamin D is a drug with multiple effects, including inhibition of bone breakage and promotion of osteogenesis, in addition to increasing muscle strength in the elderly, improving balance, preventing falls, and thus reducing the incidence of fractures. Active vitamin D and its analogues mainly include 1,25 dihydroxyvitamin D3 (osteotriol) and 1 alpha hydroxyvitamin D3 (alpha -osteotriol, e.g. alfadisil).