There are the following precautions after bile duct drainage: 1. A mark should be made for the position and depth of duct insertion, and the drainage tube should be properly fixed, because a well-fixed drainage tube is a prerequisite to ensure effective bile drainage. At the same time, the T-tube should be prevented from dislodging, because once the T-tube is dislodged, it will cause biliary peritonitis and require reoperation in serious cases. Therefore, once the duct is dislodged, you should go to the hospital in time, and sometimes you need to place the duct through this sinus again to avoid serious consequences; 2. Keep the wound dressing at the mouth of the drainage duct and the surrounding area clean and dry, and change the dressing in time when it is wet to prevent retrograde infection caused by backflow; 3. Keep the drainage duct unobstructed, prevent the drainage duct from being twisted, pressured, or folded into an angle blockage to ensure smooth bile drainage, which is To ensure the smooth drainage of bile is an important part of the successful cure of biliary tract diseases. If it is found that the drainage tube is not open, the cause should be promptly identified and eliminated; 4. The nature, color and drainage flow of bile duct drainage fluid should be closely observed after surgery.