Common tests for precocious puberty in pediatric patients include the following: 1. Measurement of plasma sex hormone levels. The measurement of sex hormone levels can determine whether there is precocious puberty; 2. Gonadotropin-releasing hormone excitation test, which can help us determine whether it is central or peripheral precocious puberty; 3. Bone age determination. The determination of bone age is based on the x-ray of the hand and wrist to assess whether the bone age matches the actual life age. In children with precocious puberty, the bone age generally exceeds the actual age; 4. We can choose ultrasound to check the development of ovaries and uterus in girls, testes and adrenal cortex in boys; 5. For children who are young or have central nervous system symptoms, CT and MRI of the head can be performed. For children with suspected adrenocortical hyperplasia or adrenal gland abnormalities, CT and MRI of the adrenal glands can also be performed; 6. Other tests are thyroid function and adrenal function. For children with hypothyroidism, we should test their thyroid function, that is, T3, T4 and TSH; for children with congenital adrenal cortical hyperplasia, we can test blood 17-hydroxyprogesterone and urinary 17-hydroxysteroids. In the process of clinical diagnosis, we have to choose specific tests according to the child’s specific situation, rather than saying that every child needs all the tests.