Radiation therapy is one of the main methods in the clinical treatment of malignant tumors，and plays an important role in the comprehensive treatment of tumors.However，its side effects in the digestive system often occur，among which radiation enteritis is the most common.In particular，the radiation enteritis is most likely to occur.Professor LI Tong believes that radiation enteritis belongs to the category of “diarrhea” in traditional Chinese medicine，which is based on qi deficiency and marked by qi stagnation.The lesion viscera are in spleen and large intestine，involving liver and kidney.The pathological factors are intermingled dampness，heat，blood stasis，toxin，and deficiency.In clinics，the treatment is mainly invigorating spleen for eliminating dampness.According to the principle of “regulating qi”，the method of “invigorating qi and regulating qi” has been used to restore the synergistic effect of viscera and qi in various pathological changes，with good effects.