Precocious puberty in boys is defined as: the appearance of secondary sexual characteristics before the age of 9 years and their rapid progression, but the progression of sexual development is similar to normal pubertal development. Accelerated height growth is the earliest sign of sexual development, but is often overlooked. Subsequently, testicular enlargement appears, which is an important feature of male true precocious sex signs performance. Further penile growth, scrotal enlargement, increased scrotal skin folds, deepening pigmentation, pubic hair growth, increased penile erection, and seminal emission. The sequence of the appearance of male secondary sexual characteristics such as axillary hair, beard, throat knot and voice change is also similar to that of normal pubescent children, only at an earlier age. Due to the early secretion of testosterone, the increase of testosterone concentration in the blood makes the bone maturation increase and leads to premature healing of the epiphysis, which shortens the time frame for height growth and can lead to short stature. Height has a great impact on a child’s future development, so once a child is found to have early development now, it is important to seek medical attention in a timely manner. Early treatment has a better effect on the child’s future height growth. Parents who have any questions about their child’s precocious puberty can leave a message online or choose to consult with me one-on-one by phone.