Abstract
Research on 1926 pupils (942 schoolboys and 984 schoolgirls) at the average age of 12 -15, they are from 3 Secondary schools of 3 districs in Hanoi. The results had shown that, the order of appearance of secondary sexual characteristics of secondary pupils follow the rules of growth and normal development of age. However, the time appear the secondary sexual characteristics of secondary school students in Hanoi earlier the same age in some other localities. There are differences in age and percentage of pupils appearing for the secondary sexual signs in boys and girls, in which these signs of girls appear earlier than boys.
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