Tracheotomy catheter replacement consists of two parts, namely, equipment preparation and replacement operation. 1. Equipment preparation: prepare a new catheter, disposable syringe, liquid paraffin, disinfectant (alcohol or complex iodine), lidocaine, and heart guide before replacing the catheter. 2. Replacement operation: keep the patient lying down, firstly, carry out routine disinfection of the skin at the site of anterior cervical intubation, lay a sterile towel, put lidocaine along the lumen of the incised tracheal tube to carry out surface anesthesia, and then carry out suctioning, and suction the sputum and the foreign matter in the oral cavity to be fully cleaned up. Next, the air in the air sac of the original trocar was evacuated with a syringe, the guide core was placed, the original trocar was removed and a new trocar was inserted, the guide core was pulled out to fill the air sac, and the catheter was fixed. The whole operation should be kept gentle and standardized, and carried out by professionals, and if there is any discomfort, it is necessary to consult a doctor in time.