Under normal circumstances, there is a small amount of fluid in the abdominal cavity, which has a lubricating effect on the intestine. If the increase in abdominal fluid is caused by pathological reasons, more than 200 ml is called peritoneal fluid, as there are more causes of peritoneal fluid, no matter what the cause is, it is related to the disease, which needs to be treated for the cause along with active comprehensive treatment. 1, limit sodium intake, especially in patients with hypoproteinemia, should be strictly controlled, the diet should be high protein, high vitamin, low fat and low salt diet, the purpose is to get rid of excess water out of the body as much as possible. 2, supplemental albumin, mainly for the treatment of peritoneal effusion caused by the decrease in plasma colloid osmotic pressure due to hypoproteinemia. 3, the appropriate application of diuretics, can accelerate the discharge of water from the kidneys, it is generally recommended to combine the application of potassium-preserving diuretic and potassium-discharging diuretic drugs, so as to achieve the best effect of urination, without causing electrolyte disorders. 4, peritoneal fluid drainage, if the fluid is more, affecting breathing or the patient’s abdominal distension symptoms are heavy, can be taken to put the peritoneal fluid to reduce the symptoms, each extraction of about 2000 ml is appropriate. In short, it is necessary to actively treat the primary disease according to the specific cause, and at the same time pay attention to the changes in the condition and take corresponding treatment measures in a timely manner.