Peritoneal cancer combined with ascites, which is the most common manifestation, most patients with peritoneal cancer are combined with ascites, the treatment is the same as peritoneal cancer treatment, as follows: 1. to perform peritoneal tumor decompression, firstly, to perform surgery to remove and decompression of peritoneal tumor to the maximum extent, and then enter into thermal perfusion chemotherapy; 2. thermal perfusion chemotherapy, on the basis of decompression, to place peritoneal perfusion drainage tube, dock with perfusion fluid, and carry out perfusion If the peritoneal tumor of cancer cells is killed, the ascites will be naturally reduced and there will be no root cause of ascites. Thermal perfusion chemotherapy plus reduction is the most effective way to reduce cancer cells, and thermal perfusion chemotherapy on this basis will treat ascites completely. According to WHO regulations, cancerous ascites is cured if it lasts for more than 1 month after treatment and does not appear again. If the cancerous ascites lasts for more than 1 month and is reduced by more than 50%, it is effectively improved. If ascites lasts for more than 1 month and no longer increases, but also does not decrease, it is called stable. In some cases, after treatment, ascites recurs in less than 1 month and increases and increases again, which is ineffective treatment. To treat cancerous ascites with abdominal thermal perfusion chemotherapy according to this criterion, the efficiency is over 90%.