In modem affluent society, the situation of childhood-onset anorexia nervosa becomes more and more common. In the opinions of modem medicine, bad eating habits, bad living habits, psychological factors, micronutrient deficiencies, poor gastrointestinal function or the use of drugs affecting appetite, are all related to the cause of anorexia nervosa; in chinese medicine, we believes that eating problems or impairment of splenic movement and transformation are resulted in anorexia nervosa. We can have patterns divided into the spleen fails with damp-heat or food accumulation, spleen-stomach qi vacuity, insufficiency of stomach yin and liver-stomach disharmony. Although the disease, at first, is in slow progress, when turning into long-term and severe anorexia, it can lead to malnutrition, physical weakness, and even affect the growth and development of children. This case would be for a 9-year-old female patient in the beginning of a childhood with a small appetite, predilection for certain foods , and poor growth . She is treated by Baohe Wan and be improved. In modem society, it can be as a reference to the treatment of anorexia nervosa with traditional chinese medicine.