Inhalation lung injury is caused by inhalation of various harmful substances caused by varying degrees of tracheal, bronchial and lung parenchymal injury, the milder can only have irritating cough, chest tightness and other discomfort; the more serious can appear airway obstruction, lung inflammation, and even acute Junction syndrome and multi-organ insufficiency syndrome, and endanger the life of the patient. Respiratory burns are lung injuries caused by the inhalation of large amounts of heat, steam, flame, smoke and accompanying chemical toxic gases. The lighter damage to the nasal cavity and throat, the more serious can cause respiratory and lung damage. First, the cause of respiratory burns respiratory burns often occur in the confined or unventilated room, this is because the flame in a narrow space of high temperature and not easy to spread, while the casualty is not easy to evacuate. Incomplete combustion produces a large number of carbon monoxide and other toxic gases to poison the casualty, or even death. Especially in the explosion when burning instantly generated a lot of heat and strong shock waves, often make the casualty unconscious and inhale a lot of toxic smoke. 1, heat damage. 2, chemical damage. Second, the pathogenesis 1, airway obstruction. 2.Decreased lung compliance. 3.Increased lung water content. 4, pulmonary ventilation/blood flow disorders and increased intrapulmonary shunt. The stage of the disease 1, respiratory insufficiency. 2.Pulmonary edema stage. 3.Infection stage. The diagnosis of respiratory burns X-ray examination: early due to airway mucosal edema, ortho- and left anterior oblique X-ray chest film can be seen narrowing of the lumen, thickening of the wall, mucosal irregularities, sometimes funnel-shaped at the bulge, which is helpful for early diagnosis. 84% of patients with respiratory burns were found to have abnormal changes within 48 h after injury using the scoring system, such as thickening of the bronchial wall, small lamellar shadows etc. It is now believed that continuous dynamic observation of chest radiographs should be performed to understand the development of pulmonary lesions and the effect of treatment. Special examinations: 1, fiberoptic bronchoscopy. 2.Bronchoalveolar lavage. 3.Isotope examination. V. Treatment of respiratory burns 1.Rescue poisoning and correct hypoxemia. 2.Release the obstruction and keep the airway open. 3.Resuscitation. 4.Mechanical ventilation.