The puberty development time for boys is usually 9~13 years old, and precocious puberty occurs below 9 years old, which causes harm in physical aspects such as early development and short stature, as well as in psychological aspects such as psychological burden and affecting socializing, and so on. When signs of precocious puberty are detected, medical examination should be conducted and active treatment should be taken. 1. Physiologically, precocious puberty in boys is mainly characterized by early development of sex organs and short stature in adulthood. After precocious puberty, the secretion of androgen will increase, resulting in the enlargement of testicles, the emergence of pubic hair and armpit hair, and gradually have the ability to reproduce; at the same time, the development of bone age is advanced, the growth speed is accelerated, resulting in the premature closure of epiphysis and growth stagnation, and the height of the boy is lower than the normal level. 2. Psychologically, due to the mismatch between the advancement of physical development caused by precocious puberty and the level of psychological and intellectual development of boys, compared with their peers, they appear to be more special in appearance, which will easily lead to anxiety, fear and other emotions and lead to psychological disorders, and they will have low self-esteem or autistic mentality, which will cause an additional psychological burden, and even affect the normal communication with the people around them. When boys experience early sexual maturity, please consult a doctor immediately for prompt treatment.