The volume of fluid drained for the first time should not be more than 1,000 ml, because a large amount of peritoneal fluid, also known as ascites, is commonly caused by patients with liver disease, cirrhosis or advanced malignant tumors of the liver, and if too much fluid is drained, it is easy to have a sudden drop in the pressure of the peritoneal cavity, which will lead to an increase in the secondary peritoneal fluid. Abdominal fluid exclusion, the loss of a large number of nutrients and ions, induced internal environmental disorders, serious anemia, hypoproteinemia aggravation, and even lead to the aggravation of respiratory distress. Some patients with large amounts of dehydration may also develop pulmonary edema, manifested by chest tightness, dyspnea, coughing pink foamy sputum, so the fluid should be drained in a controlled manner, and the speed should not be too fast. At the same time in the drainage of fluids, should also monitor changes in the internal environment indicators, if necessary, with the supplementation of human albumin treatment.