Endotracheal intubation is a technique of providing oxygen and airway ventilation to the patient through a special catheter inserted into the trachea. Tracheal intubation is mostly used to maintain vital signs when the patient’s spontaneous respiration stops, and transoral intubation is also required during general anesthesia, with no absolute contraindications, and relative contraindications include oral and maxillofacial trauma, upper respiratory tract burns, laryngeal edema, acute laryngitis, and laryngeal submucosal hematoma. The intubation process must pay attention to ensure oxygen supply. The general procedure is to open the airway, inspect the mouth, epiglottis, and vocal folds, insert the laryngoscope, place the catheter, withdraw the guidewire and laryngoscope, place the dental cushion, secure the catheter, and connect the catheter to the ventilation device. Endotracheal intubation is a first aid technique that requires a trained physician to use correctly. In such cases, the patient should be taken to the hospital as soon as possible for professional management.