The main purpose of abdominal drainage is to remove fluid from the abdominal cavity by puncture and drainage. This not only reduces clinical symptoms, but also can be used to determine whether there is damage to the abdominal viscera and the specific cause of the fluid in the abdominal cavity. To drain the abdominal cavity, the most obvious site for peritoneal fluid is usually selected for puncture, and this can be done by applying ultrasound for localization, such as around the liver, prior to puncture. After determining the puncture site, local disinfection with iodophor, infiltration anesthesia with lidocaine, and application of a puncture needle into the abdominal cavity via the puncture site, the fluid is retracted and further determined. A guide wire is placed through the puncture needle and then removed, and a drainage tube is placed along the guide wire and properly secured, with the drainage tube connected to a drainage bag. The drainage fluid can be further examined, such as routine, looking for tumor cells, etc. A preliminary judgment can also be made based on the nature of the drainage fluid. However, it should be noted that after surgical puncture and drainage, the amount of fluid released should be strictly limited and should not exceed 1000-2000ml to avoid serious adverse reactions.