Radiation pneumonia is an inflammatory reaction caused by radiation damage to normal lung tissue after radiotherapy for lung, esophageal, breast or other tumors in the chest. In mild cases, it is asymptomatic and can be left untreated; in severe cases, extensive fibrosis of the lungs occurs, leading to respiratory distress and even respiratory failure. The severity of lung damage is closely related to the radiation dose, the area of the lung exposed, and the rate of exposure. The pathological changes are characterized by an exudative inflammatory response in the acute phase and extensive lung tissue fibrosis in the chronic phase. Western medicine glucocorticoids have a controlling effect on inflammation in the acute phase. Chinese medicine treatment can be based on the identification of evidence, with reference to this formula plus or minus, clinical efficacy: angelica 15g, red peony 15g, shanduan root 15g, guadua bark 30g, caohe che 15g, small thistle 30g, chuanxiong 10g, raw earth 10g, bai bao 15g, almond 12g, aromatic herb 30g, saffron 10g.