The treatment of abdominal fluid in children should pay attention to the following points: First, if the abdominal fluid in children is <1.0 cm in depth through ultrasound examination and the child is not accompanied by any clinical symptoms, we generally consider it to be a normal abdominal lubricating exudate and can be left untreated. If the amount of effusion is >1.0 cm, the nature of the effusion should be considered, whether it is exudative or leaky. Exudative effusion is usually caused by inflammation, and it is usually treated by active treatment of the primary disease while anti-infection, such as surgical treatment or drug treatment, etc.; second, leakage, leakage is usually caused by hypoproteinemia caused by liver disease or kidney disease, resulting in tissue leakage. It is also treated as follows: 1. active treatment of the primary disease. 2. to correct the hypoproteinemia.