Precocious puberty is a particularly common disease that affects the health of affected children. Many children who suffer from precocious puberty experience personality changes, which can be very harmful to their growth. Under normal physiological conditions, girls generally begin to mature and complete their growth about 2 years earlier than boys. However, with the current improvements in nutrition, health and standard of living, there is a tendency to advance the age of puberty more and more. Physical development during adolescence includes reaching adult height and weight and musculoskeletal growth. All organs increase in size, except for the lymphatic organs, which are smaller in size, and the brain, which is stagnant in growth. Once sexual development is initiated, both boys and girls follow a certain sequence of development. Girls begin to experience breast enlargement, followed by the appearance of pubic hair, axillary hair, and the first menstrual period. In boys, the scrotum and testes begin to enlarge, followed by the development of pubic hair, seminal vesicles and the prostate gland. Accelerated body growth usually occurs about 1 year after the onset of testicular enlargement. Armpit hair and beard appear about 2 years after the appearance of pubic hair, and mature sperm appear at the age of 14 to 16, with seminal emission. Precocious puberty is a health killer for children, not only is it physically harmful, but it also affects children psychologically. 1, affect the final height. For precocious puberty, due to the stimulation of sex hormones in the body, height grows faster and earlier than peers, but it will lead to earlier bone age and shorten the years of final growth, which eventually affects height and is shorter than normal children. 2.Impact on school. Obstacles occur in life and psychological aspects, and serious cases can affect schooling. 3.The danger of tumor. Some precocious puberty is due to the growth of tumors in the gonads or adrenal glands, and the tumors will release some substances, which are then related to sex hormones. Although the tumor is not large, the amount of hormones released is enough to cause precocious puberty. When the tendency of precocious puberty is found, it must be rectified early. 4. Early sexual behavior. There is a mismatch between the mental and physical development of the child. The age is too young, and there is no social experience and. Self-control is not as good as adults, so it will lead them to early sexual behavior, there is a risk of pregnancy, sexually transmitted diseases, etc. 5.Personality repression. The child can appear psychological burden, there are inferiority complex, uneasiness and other emotions inside, which is not good for health in the long run.