1. Avoid eating: poultry raised with synthetic feed (instant chickens, etc.), anti-seasonal vegetables and fruits, soy products, sweet potatoes and other foods containing phytoestrogens, supplements (snapper, oyster, pollen, royal jelly), synthetic foods, high-protein supplements, etc. Please pay attention to media reports on food and “environmental endocrine hormone disruptors”. 2. Avoid: cosmetics containing vitamin E and placenta (sunscreen, skin whitening and rejuvenation …..) Brightly colored TV programs, video game programs, etc. (to prevent early activation of the gonadal system through retinal stimulation) Try to avoid plastic toys, plastic drinking bottles, etc. 3. Note: Put away the birth control pills used by parents and read the side effects of the medicines used by children. Pay attention to the ingredients of baby baths. 4.Strengthen: physical activity to help growth and prevent overweight. 5.Checkup items: abdominal ultrasound (uterus, ovaries), bone age, serum gonadal hormone level. Review time: abdominal ultrasound every 3 months, ultrasound and serum hormone level and bone age every 6 months. 6. Treatment: (1) Chinese medicine “Zhi Bai Di Huang Wan or Da Yin Wan”, 2-3 times a day, 6-8 capsules each time. Adjust the dosage according to the child’s condition, but the Chinese medicine cannot suppress bone age. (2) GnRHa, a gonadotropin-releasing hormone analogue, should be injected intramuscularly once every 4 weeks, and the duration of treatment should be extended if the child weighs less than 30 kg according to medical advice. Side effects may include vaginal bleeding about a week after injection in a small number of children, and a single menstrual period in mature children. For children who are quite mature or who have already had their first menstrual period, treatment should be intensified once every 2 weeks after starting treatment. (3) For some children whose final height is affected by precocious puberty, additional growth hormone should be used to help them grow if necessary. 7.Treatment termination age: after 11 years old.