Abdominal puncture, clinically called laparotomy, is a commonly used diagnostic or therapeutic tool. It is mainly used as a diagnostic method for large amounts of ascites, for releasing ascites to reduce intra-abdominal pressure, or for trauma suspicion of intra-abdominal hemorrhage. In clinical practice, laparotomy mainly includes the following aspects: selection of the puncture site, the most commonly selected site is the antimaculature point, which is the outer 1/3 point of the line between the umbilicus and the left anterior superior iliac spine as the puncture point. After selecting the puncture point, local iodine and alcohol disinfection, then lay a towel, puncture with a 9-gauge needle to avoid the fat blocking the puncture needle because of the 7-gauge needle is too thin, then break through the skin and then enter the needle at an oblique 45 degrees, break through the peritoneal layer, and then enter the needle vertically, so as to form an oblique sinus tract in the abdominal wall, even after a large amount of ascites, after pulling out the puncture needle, it will not lead to a large amount of ascites leakage because of the vertical sinus tract.