Summary of case history ,The female patient, 7 years old, arrived at our hospital due to "bilateral breast development for more than 6 months". Examination of color Doppler ultrasound of uterus and appendages was performed in a hospital in Kunming on July 20, 2019, and the results showed that the images of follicles were seen in both ovaries, and the diameters were more than 0.4 cm. The level of six sex hormones were examined on September 22, 2019, and the results showed that, luteinizing hormone: 0.1 IU/L; Follicle-stimulating hormone (FSH): 5.55 IU/L; Prolactin: 135.3 mIU/L; Estradiol: 18.4 pmol/L; Progesterone 0.738 nmol/L; Testosterone 0.09 nmol/L.,TCM diagnosis, Precocious puberty (syndrome of yin deficiency with effulgent fire),Western medicine diagnosis, Precocious puberty,Diagnostic methods ,The diagnosis was made according to the main symptoms of the patient and the results of auxiliary examination of color Doppler ultrasound of uterus and appendages and the level of six sex hormones.,Therapeutic methods ,The patient was given the ,Zhidi Guijia, decoction orally, and she was instructed to increase exercise appropriately and control her diet, including not eating honey, soybean milk, fried food, and not abusing tonic things.,Clinical outcomes ,After three months of telephone follow-up, the patient's breasts did not enlarge.