When gastric cancer patients develop peritoneal metastasis with nausea and vomiting, they should adopt individualized treatment plan through clinicopathological staging, and commonly used treatment modes include surgery, chemotherapy, radiotherapy and so on. 1. Surgery: Gastric cancer with peritoneal metastasis can be treated with non-radical surgery such as tumor reduction surgery, but it is not recommended at present. 2. Chemotherapy: peritoneal metastasis is a special metastatic pattern of advanced gastric cancer, and patients are often accompanied by cancerous ascites and cancerous intestinal obstruction, therefore, patients need to undergo ascites drainage, peritoneal instillation chemotherapy according to the cause of abdominal distension, and combine with systemic chemotherapy in a selective stage. 3. Radiotherapy: Gastric cancer patients with peritoneal metastasis can irradiate the primary lesion or metastatic lesion according to the actual situation, so as to effectively alleviate compression, obstruction, bleeding, pain and improve the quality of survival. Individuals should have regular medical checkups, and once malignant lesions are found in the stomach, they should intervene in the treatment as early as possible, so as to prevent the malignant tumor cells in the body from spreading and metastasizing.