Result: The girl with acne on their faces accounted for 70.5%, the boys with acne on the faces accounted for 51.0%; the rate of pubic hair growth increases with age; Armpit hair is also one of the typical signs of puberty. However, it does not appear as early and common as the pubic hair; The average age of the girl with first menstruation (13 years 1 month ± 1 year 3 months) which is earlier than the age of the boys with first ejaculation (14 years 1 month ± 1 year 2 months).