The five-year survival rate of gastric cancer with peritoneal metastasis after treatment is about 10%, which can be slightly different. Gastric cancer is a common malignant tumor of the digestive system caused by Helicobacter pylori infection, poor dietary habits and other factors. When the disease develops to the advanced stage, distant metastasis, such as peritoneal metastasis, can occur. At this time, patients may present malignant ascites, abdominal distension, abdominal pain and other clinical manifestations. In this period, due to more foci and complexity of the disease, non-surgical therapies, such as radiotherapy and targeted therapy, can be used; ascites can also be extracted by peritoneal puncture for symptomatic treatment. After active treatment, patients can obtain a five-year survival rate of about 10%. However, the purpose of late-stage treatment is to improve the quality of life and prolong the survival period. For peritoneal metastasis of gastric cancer, it is still necessary to actively consult the doctor and follow the doctor’s instructions for reasonable treatment.