Patients with abdominal fluid accumulation can use laparotomy to extract the abdominal fluid. Specific steps are as follows: 1, according to the condition and needs, the patient can take the lying position, semi-recumbent position or slightly left lateral position, as far as possible to make the patient comfortable, empty the urine; 2, choose the appropriate puncture point, a small number of effusion or encapsulated fluid, ultrasound-guided puncture localization; 3, wear sterile gloves, puncture site routine disinfection and cover the hole towel, 2% lidocaine from the skin to the peritoneal wall to do local anaesthesia; 4, the operator with the left hand fixed puncture part of the skin, the right hand holding the needle through the anesthesia into the abdominal wall to extract ascites, and the extracted liquid can be extracted. Left hand fixed puncture part of the skin, the right hand holding the needle through the anesthesia into the abdominal wall can be extracted ascites, and will be put into a test tube for examination. For diagnostic puncture, 20ml or 50ml syringe and appropriate needle can be used directly. When a large amount of fluid is released, a No. 8 or No. 9 needle can be used, and a rubber tube can be connected to the base of the needle, and then the infusion clip can be clamped to regulate the speed, and the ascites can be introduced into the container for measurement and laboratory examination. The fluid should not be discharged too much too fast, generally not more than 3000 ml at a time. after the end of the discharge, pull out the puncture needle, cover with gauze and bandage. After the operation, the patient was instructed to lie down and rest for 2 hours, avoiding lying on the side of the puncture, measuring blood pressure and observing whether there is any change in the condition of the patient.