If children have fire-eating, the main symptoms are constipation, bad breath, reluctance to eat, and in some cases fever and vomiting. Fire-eating is mainly due to gastric fire, Chinese medicine says that the stomach is the main transporter, the small intestine is the main fluid, and the large intestine is the main conductor of dregs, when gastric fire is strong, the transport function of the spleen and stomach is out of harmony, and it can’t transport water and grains to the intestines, and when intestinal fire is strong, it absorbs too much water from the food residue, which affects the function of the large intestine in conducting the dregs. The treatment should be based on the drugs of generating fluids and removing fire, moistening the intestines and relaxing the bowels, and can be given with the addition or subtraction of Da Cheng Qi Tang. At the same time, the children should pay attention to their daily dietary habits, drink more water, eat less greasy and spicy food, strengthen physical exercise, eat more green vegetables and fruits, supplement fiber, and promote defecation.