Generally speaking, the best treatment for gastric cancer is surgery, and those that can be surgically removed should be surgically removed as much as possible. According to the stage of gastric cancer, early stage gastric cancer that can be surgically removed should definitely be surgically removed. However, for some patients with progressive or advanced gastric cancer, unless there is obstruction or bleeding, there are many neoadjuvant chemotherapy methods to be used. That is to say, once diagnosed with gastric cancer, it is better to find a specialist to evaluate and decide whether to operate first, or to do adjuvant treatment first or to do adjuvant treatment after surgery according to the stage, physical condition and clinical manifestations. However, in general, gastric cancer that can be removed should be removed as early as possible. Early gastric cancer, such as stage T1 gastric cancer, can survive for a long time after local resection under gastroscopy. As long as the postoperative pathology meets the requirements, extended resection can be avoided. A small number of early gastric cancers can be operated endoscopically without major surgery and the hospital stay should not be too long. In case of advanced stage patients, with liver metastasis or poor local condition, many of them have to do surgery to solve these symptoms because of obstruction and bleeding. In some patients, surgery is not necessary, and comprehensive treatment can improve their survival conditions; surgery is not very meaningful for patients. A small number of advanced patients can be treated by chemotherapy or combination therapy to shrink the lesions to meet the requirements of surgery. Even some patients with advanced gastric cancer have liver metastasis, lung metastasis, and isolated metastasis, as long as the primary and metastatic foci can be removed, they still try to remove them.