Inhalation injury refers to chemical damage to the respiratory tract caused by inhalation of toxic fumes or chemicals, and in severe cases, the lung parenchyma can be directly damaged. It mostly occurs in large areas, especially with head and face burns. The cause of inhalation injury is mainly thermal effect, but at the same time inhalation of a large number of unburned smoke, charcoal particles, irritating chemicals, etc., the same damage to the respiratory tract and alveoli, the tracheal prominence above the injury prevention methods are what? Prevention of infection: after inhalation injury, due to the damage to the airway and lungs, the cilia function is destroyed, airway secretion and foreign matter can not be discharged in time, local and systemic resistance is reduced, etc., which often leads to airway and lung infection. Once infected, if the treatment is not timely, it can complicate acute respiratory failure and become an important focus of systemic infection, inducing sepsis. Thorough removal of foreign bodies and detached necrotic mucosal tissues in the airway and smooth drainage are the basic measures for prevention and treatment of infection, followed by strict aseptic operation techniques and disinfection and isolation, strict control of trauma-lung-trauma bacterial cross-infection; regular smear and culture of airway secretions, and selection of sensitive antibiotics. In addition, systemic supportive therapy should be strengthened to improve the body’s immune function, which is of rational significance to the prevention and treatment of infection. The heat of inhalation injury causative factors includes both dry heat and moist heat. Flames and hot air belong to dry heat, and hot vapor belongs to moist heat. When breathing in hot air, the vocal cords can be reflexively closed, while the heat transfer capacity of dry hot air is poor, the upper respiratory tract has a water heat exchange function, can absorb a large amount of heat to make it cooler; dry hot air to reach the bronchial bifurcation of the bulge, the temperature can be reduced to the original 1/5 ~ 1/10. Therefore, the dry heat often cause upper respiratory tract injury. Moist heat air than dry heat air heat capacity of about 2000 times, the conduction capacity of dry air about 4000 times, and slow heat dissipation, so moist heat in addition to cause upper respiratory tract damage and tracheal injury, can also be caused by the bronchial tubes and lung parenchyma damage.