1. According to the patient’s condition, choose a suitable tracheal tube and select two catheters, one large and one small, for backup. 2.When revealing the voice, the laryngoscope should not be pried up with the incisors as the pivot point. Do not squeeze the tip of the tongue and lower lip between the laryngoscope and the teeth. 3.After revealing the voice box, hold the tracheal tube in the right hand and insert it gently. If there is difficulty in entering the tube because of the thickness, replace the tube early and do not force it through with violence. 4, in case of difficult intubation, reveal the larynx for more than 2 minutes when the operation is suspended, perform pressurized oxygen inhalation for a moment, and then continue intubation, two intubation is not into that is to request the assistance of a higher-level physician. When the front end of the tracheal tube enters the vocal cords, the tube should be removed and then the catheter should be pushed into the trachea. After intubation, place the dental pad before withdrawing the laryngoscope. The balloon is moderately inflated and the breath sounds of both lungs are listened to, while the catheter and dental pad are fixed exactly afterwards. Complications Immediate complications: dental and oral soft tissue injury, hypertension and tachycardia, arrhythmia, catheter misplacement into the esophagus. Complications during retention: catheter obstruction, catheter dislodgement, catheter misplacement into unilateral main bronchus, choking, bronchospasm, improper suctioning practices. Complications at extubation: laryngospasm, foreign body obstruction, tracheal atrophy. Complications after extubation: pharyngolaryngitis, laryngeal edema or subglottic edema, vocal cord paralysis, lung infection, tracheal stenosis.