Ascites of gastric cancer may be caused by hypoproteinemia and metastasis of cancer cells, and nutritional support, puncture and anti-cancer treatment should be taken according to the causes. 1. Nutritional support: patients with advanced stage of gastric cancer are in high malnutrition state, which will lead to hypoproteinemia and cause ascites, in this case, it is necessary to do nutritional support treatment, input albumin through vein, and eat more high-protein food at the same time. 2. Drainage by puncture: if the ascites is serious and there is difficulty in breathing, it is necessary to drain the fluid by puncture, so as to alleviate the symptoms of abdominal distension and difficulty in breathing; in the later stage, chemotherapy can also be carried out by peritoneal perfusion. 3. Anti-cancer treatment: As ascites is a manifestation of advanced gastric cancer, so radiotherapy, chemotherapy and other anti-cancer treatments are needed to control the condition. It is suggested that patients should consult doctor in time, choose appropriate treatment method according to their own conditions and treat actively so as to avoid delaying their condition.