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Objective. To study the whole body bone mineral changes in normal subjects.Methods. Bone mineral was measured by dual X-ray absorptiometry （DXA） in 292 normal subjects aged 10

7

9 years

including 152 females and 140 males. They were divided into age-groups by decade.Results. In males

the ages with peak value of total bone mineral content （TBMC）

total bone mineral density （TBMD）

anteroposterior spine BMD（L2-4 BMD） were in the 30-39

20-39

20-29 age-groups respectively. In females

they were all in the 30-39 age-group. Peak values of TBMC

TBMD

L2-4 BMD were higher in males than those in females. Loss of bone mineral for females was more pronounced than that for males. Loss of L2-4 BMD was more pronounced than TBMD.Conclusion. This study provides the normal bone mineral data of whole body for males and females

and the characteristic of changes.