I. The treatment of gastric cancer should follow the principles to achieve the purpose of radical or maximum tumor control, prolong patient’s survival and improve the quality of life. 1.Early stage: endoscopic mucosal dissection (ESD): (1) differentiated intra-mucosal carcinoma without ulceration, regardless of lesion size; (2) differentiated intra-mucosal carcinoma with combined ulceration less than 3cm in diameter; (3) differentiated sm1 carcinoma less than 3cm without ulceration and lymph node metastasis; (4) low-differentiated intra-mucosal carcinoma less than 2cm in diameter without ulceration. No adjuvant radiotherapy or chemotherapy is needed after surgery. 2.Locally progressive gastric cancer or early gastric cancer with lymph node metastasis: a comprehensive treatment mainly based on surgery is adopted. Depending on the invasion depth and whether it is accompanied by lymph node metastasis, direct radical surgery or neoadjuvant chemotherapy can be considered before radical surgery. Adjuvant treatment plan (adjuvant chemotherapy and, if necessary, adjuvant chemoradiotherapy) should be decided according to the postoperative pathological stage for locally progressive gastric cancer that has been successfully performed radical surgery. 3.Recurrent/metastatic gastric cancer: comprehensive treatment means, palliative surgery, radiotherapy, interventional therapy, radiofrequency therapy, etc. should be adopted, and supportive treatment such as pain relief, stent placement, nutritional support should also be actively given. Surgical resection is the only way to cure gastric cancer at present. Surgery is divided into radical surgery and palliative surgery, and radical resection should be strived for. Radical surgery for gastric cancer includes ESD, D0 resection and D1 resection for early gastric cancer, (D2) and expanded surgery (D2+) for partially progressive gastric cancer. Palliative surgery for gastric cancer includes palliative resection for gastric cancer, gastrojejunostomy, etc. Laparoscopy is a recently developed minimally invasive surgical technique, and the application of laparoscopy in gastric cancer should be appropriate for stage I patients. II. Surgical style and indications. (1) Standard surgery: D2 radical surgery is the standard surgery for gastric cancer. If the depth of tumor infiltration exceeds the submucosa layer (muscle layer or above), or if there is lymph node metastasis but it has not yet invaded the adjacent organs, standard surgery (D2 radical surgery) should be performed. (2) Standard surgery + combined organ resection: those whose tumor infiltrates the adjacent organs. (3) Palliative surgery: Only for those with distant metastasis or tumor invading important organs that cannot be resected while combined with bleeding, perforation, obstruction, etc. Palliative surgery is aimed at relieving symptoms and improving quality of life. The standard is the life and foundation of every ethical and conscientious doctor, without the standard doctor is equal to butcher, even as a murderer.