The child’s sex hormone test at the age of eight suggested that luteinizing hormone was 0.3 IU/L which is considered to be in the normal range. Luteinizing hormone is a hormone secreted by the female pituitary gland, which works synergistically with follicle-stimulating hormone to promote the production of estrogen, progesterone, and some androgens by the female ovaries. For an eight-year-old girl, its normal value is 0.02~4.12 IU/L, so 0.3 IU/L is in the normal range. For girls who are found to have high luteinizing hormone, it is necessary to be alert to the occurrence of precocious puberty. Some girls may have a sudden increase in height, the appearance of pubic hair, armpit hair, the onset of menstruation and other secondary sexual characteristics, and at this time it is recommended that parents take their children to the pediatrics department of a regular hospital as early as possible, so that they can clearly identify the type of precocious puberty and then be actively treated under the guidance of the doctor.