The main purpose of sputum suction is to remove sputum through the negative pressure of the suction device and promote the discharge of sputum, and the commonly used operation methods include catheter sputum suction method. The operation method of catheter sputum suction method is to prepare for sputum suction, turn the patient’s head to the side of the operator, fold the end of the catheter with one hand, hold the sputum catheter with the sterile holding forceps with the other hand, insert the head end into the patient’s oral cavity, step on the switch of the suction device, firstly, suction the secretion from the oral cavity and throat, and then lift the sputum catheter from the deep part and rotate it from side to side to suction the phlegm. If the patient needs to perform sputum suction, it is recommended that under the guidance of the doctor, after clarifying the sputum suction method that the patient needs to use, to perform the correct operation and treatment, and after suctioning sputum, the cause of sputum production should also be treated.