Peritoneal puncture and tube placement, generally for the treatment of tuberculous peritonitis and cirrhosis with peritoneal effusion as well as abdominal metastases of malignant tumors, can play a role in releasing ascites on the one hand, and can also inject some drugs into the abdominal cavity through the tube placement. The operation method of laparotomy placement is first to select the site, generally choose the left anterior superior iliac spine and the outer and middle 1/3 of the umbilical line as the puncture point, routine disinfection, then lay surgical cavity towel, take 2% lidocaine local anesthesia, choose venipuncture needle puncture into the abdominal cavity, see a yellowish or bloody fluid, then through the puncture needle into the guide wire into the abdominal cavity, exit the puncture needle, along the guide wire into the abdominal cavity puncture catheter, and then withdraw the catheter. At this point, the laparotomy catheter is placed into the abdominal cavity and can be fixed outside, and the peritoneal fluid can be released regularly every day or drugs can be injected into the abdominal cavity through the laparotomy catheter to achieve the purpose of treatment.