A bile duct drain that has come out 2 centimeters cannot be put back in. The drain needs a sterile environment, and if it comes out, a new drain needs to be reinserted in the hospital. A drain is a medical device that directs pus, blood, and fluid that accumulates between body tissues or in body cavities to the outside of the body to prevent postoperative infection and promote wound healing. Placement of a drain allows you to observe the amount of fluid and the composition of the fluid to determine if the surgery was successful or if there are any complications for the surgeon’s postoperative management. The placement of a drain requires a sterile environment, so the catheter cannot be put back in if it is dislodged from the body, and usually newly placed drains do not fall out easily. After placing the drain, the patient should pay special attention when moving around to avoid dislodging the drain, and at the same time, avoid excessive bending and pressure on the drain to cause blockage, and keep the drain low to prevent reflux of drainage fluid. If the bile duct drain comes out, don’t put it back on your own to avoid infection, you should consult the doctor for a new drain in time.