There are two general methods of removing a closed chest tube: first, if the closed chest tube has not been placed for a long time and the patient’s chest wall is relatively full, you can consider covering it with petroleum jelly gauze. When removing the tube, the patient is instructed to inhale deeply, then hold his breath and quickly remove the chest tube, while covering the chest tube opening with petroleum jelly gauze, and then gently massaging the chest wall around the chest tube opening to promote its closure. Second, if the patient’s chest tube has been placed for a relatively long time, the chest wall has formed a sinus tract, or the patient’s chest wall is relatively weak, you can usually sew a pre-positioned line at the chest tube opening first. The patient is instructed to inhale deeply, hold his breath, and quickly pull out the drainage tube, while the suture is quickly knotted to close the drainage opening.