Pulmonary airway obstruction is seen in foreign body, bronchial tuberculosis, bronchial tumor and other conditions. The onset of pulmonary airway obstruction caused by bronchial foreign body is relatively sudden, such as foreign body, eating, choking, peanut and other inhalation of respiratory tract caused by obstruction, there will be a sudden onset of dyspnea, suffocating sensation, as soon as possible to give the chest CT examination and bronchoscopy can be found in the bronchial foreign body. Bronchial tuberculosis causing pulmonary airway obstruction is characterized by blood in sputum, chest tightness, shortness of breath, cough, emaciation, hot flashes, night sweating, etc. Chest CT and fiberoptic bronchoscopy can also be given. Lung airway obstruction caused by central lung cancer is often complicated with obstructive pneumonia and obstructive pulmonary atelectasis, which is mostly seen in patients who have been smoking for a long time, with symptoms such as chest pain, blood in sputum, dyspnea and even fever, etc. Chest CT and fiberoptic bronchoscopy can be given to make a clear diagnosis very quickly in order to cooperate with the next step of treatment.