Gastric cancer metastasis to peritoneum suggests that the disease has deteriorated, the specific life expectancy is related to the patient’s physical quality and the severity of the disease, so it is impossible to accurately judge, and it is necessary to actively carry out the treatment. After gastric cancer metastasis to peritoneum, patients may show clinical symptoms such as abdominal distension, abdominal pain, nausea, etc. Comprehensive treatments such as targeted therapy, radiotherapy and chemotherapy can be used to improve the symptoms, inhibit the spreading and metastasis of tumor cells, alleviate the discomfort of patients, and prolong the survival time of patients. The chemotherapeutic drugs that can be used by patients include cytarabine, cyclophosphamide, methotrexate, etc. Targeted drugs include trastuzumab and apatinib. The drugs are recommended to be used in strict compliance with the doctor’s instructions, adverse reactions should be promptly consulted, and drug allergy is prohibited. It is recommended that patients relax and actively cooperate with doctors to receive standardized treatment to prolong the survival time of patients.