How long it takes for the abdominal fluid to disappear after surgery is determined by the amount of fluid and the patient’s ability to absorb it. A lot of fluid in the abdominal cavity after surgery is mostly due to inflammatory exudation from the incision site. If the surgical incision is small, the amount of fluid is small, and the patient’s physical condition is good, the abdominal fluid can be absorbed within 3 days; if the patient’s physical condition is poor, it may lead to secondary infection in the abdominal cavity or slower absorption time. If the surgical incision is large and the amount of fluid is large, the fluid can usually be completely absorbed within 1 week if the patient is in good physical condition; if the patient is in poor physical condition, the absorption time is usually prolonged to after 2 weeks. The formation of some abdominal fluid is related to the nutritional status of the body, cirrhosis of the liver, malignant tumors and other factors, when the surgery can not effectively improve the condition of these diseases, abdominal fluid may be difficult to disappear. After surgery, anti-infection and other related treatments should be carried out promptly to speed up the absorption of the fluid in the abdominal cavity.