I. What is precocious puberty? Precocious puberty refers to the appearance of secondary sexual characteristics, i.e. breast development, pubic hair, axillary hair, rapid growth in height and weight, and development of external genitalia, before the age of sexual development. The incidence of precocious puberty is about 0.6% in children of both sexes, with more females than males. Precocious puberty is defined as the age at which any of the sex characteristics appear 2 standard deviations earlier than the average age of the normal population. It is now generally accepted that precocious puberty can be diagnosed when secondary sexual characteristics develop or menstruation begins before the age of 8 for girls and before the age of 10 for boys. Since sexual development is related to a variety of factors and human growth and development is a continuous process, there is no very precise boundary. Some scholars believe that precocious puberty is said to occur when a girl’s breasts develop significantly before the age of 7 or when menstruation begins before the age of 9, and when a boy begins to develop sexually before the age of 9. A comprehensive examination is needed. Precocious puberty often affects the physical and mental health of adolescents, while their intellectual development is generally normal. Precocious puberty in females can easily become the target of sexual assault and even pregnancy. Individual precocious puberty also does not exclude tumor factors. Second, how should precocious sexual maturity be prevented? 1, to prevent precocious puberty, parents should also pay attention to give their children less chicken, beef, mutton, chrysalis, etc., and do not abuse the so-called children’s food without strict testing. 2, do not give children indiscriminate nutritional supplements, such as royal jelly, pollen preparations, chicken embryo and other “tonic”, proper storage of contraceptive drugs, breast enlargement beauty products, etc., so that children do not accidentally take or contact. 3, early detection, timely treatment. In addition to the necessary medical knowledge, parents should pay more attention to observe whether the child has premature appearance of secondary sexual characteristics, children under 10 years old suddenly accelerated height growth and other phenomena, once the discovery of abnormalities, should be promptly to the regular hospital for medical treatment. 4. Children with precocious puberty should be educated about menstruation and menstrual hygiene, and sex education should be started early according to children’s comprehension. In conclusion, if children have precocious puberty, as parents must release their worries, analyze the cause, explain patiently, do not let the child have a mental burden, and at the same time actively cooperate with the doctor, careful examination and treatment, then, children with precocious puberty can still develop normally, and will not affect future marriage and childbirth.