目的 探讨西藏藏族成人骨强度指数的变化特点，并分析骨量异常与体成分的相关性。 方法 抽取西藏藏族自治区日喀则市藏族成人560例，采用生物电阻抗分析仪及超声骨密度仪分别测量被研究者体成分各指标及右足跟骨骨强度指数、T 值等，采用非条件 Logistic回归法分析骨量异常与体成分间的关系。 结果 西藏藏族男女性成人骨强度指数均在18～30岁达到峰值，之后随年龄增长而下降；50岁以上男女性骨质疏松症检出率分别为7.6% 及11.7%；Binary Logistic回归分析显示，年龄（B=0.046，OR=1.047，P<0.01）、内脏脂肪量（B=0.452，OR=1.572，P<0.05）是西藏藏族成人发生骨量异常的危险因素，而皮下脂肪含量(B=-0.181，OR=0.835，P<0.01)及肌肉量(B=-0.055，OR=0.947，P<0.05)是骨量异常的保护性因素，腰臀比与骨量异常无相关性。 结论西藏藏族50岁以上人群骨质疏松症发病率相对国内其他报道的民族同龄人群较低；内脏脂肪量越高、皮下脂肪量及肌肉量越低者，发生骨量下降及骨质疏松症的危险性越高。

Objective To investigate the distribution of bone strength index of adult Tibetans in Tibet and analyze the correlation between of their body composition and incidence of bone mass abnormal. Methods The bone strength of right calcaneus, T score and body composition of 560 Tibetans in Shigatse, Tibet by using an ultrasonic bone mineral density meter and bioelectric impedance technique. Binary LogisticRegression was used to test the relationship of incidence of bone mass abnormal and body composition. Results The bone mass index of the male and female participants reached the maximum at their 18-30 years old, and then declined with aging. The incidence of osteoporosis among male and female participants ≥50 years old were 7.6% and 11.7%respectively. Age（B=0.046，OR=1.047，P<0.01）and visceral fat mass（B=0.452，OR=1.572，P<0.05）were risk factors of incidence of bone mass abnormal whereas the subcutaneous fat mass(B=-0.181，OR=0.835，P<0.01)and muscle mass (B=-0.055，OR=0.947，P<0.05)were protective factors. Conclusion The incidence of osteoporosis among Tibet Tibetans ≥50 years old are lower than other nationalities of China in the same age. The participants with high visceral fat mass while low subcutaneous fat mass and muscle mass are more likely to suffer from osteoporosis.