The main care for closed chest drainage are: i. Keep the tube closed and sterile. Second, patients with closed chest drainage are often in a semi-recumbent position to facilitate breathing and drainage. Third, maintain drainage flow. Fourth, when transporting the patient, the tube should be clamped with double clamps, and when getting out of bed, the drainage bottle should be positioned below the knee joint to maintain a seal. V. Observe the amount, color, nature, and range of water column fluctuations of the drainage fluid and record accurately. VI. If the drainage tube slips out of the chest, the skin at the wound should be pinched closed by hand immediately, and the wound should be closed with petroleum jelly gauze after disinfection. Seven, 48-72 hours after the drainage flow is significantly reduced and the color becomes lighter, 24 hours when the drainage flow is less than 50ml, pus is less than 10ml, chest X-ray indicates good lung expansion, no obvious air leakage, can be extubated.