The time for removing the drain varies depending on the condition of the patient and the specific circumstances of the surgery and postoperative recovery, and generally ranges from 1 to 21 days. The main purpose of placing drains is to drain the wound exudate and reduce the postoperative complications. The principle of removing the drains is to drain the fluid, blood, gas, etc., and observe for 1 to 2 days after the drains are cleaned up without any abnormality. 1. Most of the surgery for the discharge of traumatic blood seepage, seepage placed drain, generally 1 ~ 3 days can be removed, if the drainage flow is large or the occurrence of infection, fistula and other complications, need to be appropriate according to the treatment to prolong the drainage time to the drainage of clean and then removed. 2. Gastrointestinal anastomosis surgery, extraction time is relatively longer, most of the cases can be removed in 1 to 2 weeks, and some can do ultrasound before extraction to determine the situation. 3. If the drain is for pancreatic surgery or osteomyelitis, the removal time may take 2 to 3 weeks or longer. Drainage tube removal should be decided by the physician according to the condition of the patient and the nature of the drainage fluid, and the physician should be informed of any discomfort before or after removal.