The treatment of gastric cancer is still dominated by surgical resection, and surgery is currently the only effective way to treat gastric cancer. After decades of development and clinical evidence, the current surgical approach for most resectable gastric cancers is D2 standard radical surgery (with some early stage gastric cancers being reduced in size). The standard radical surgery for gastric cancer is not only to remove the tumor of the stomach (gastric ulcer requires removal of the large part of the stomach), but also requires complete clearance of the perigastric lymph nodes, removal of the large and small omentum and pancreatic tegument, etc. Therefore, radical surgery for gastric cancer should never be treated as surgery for benign gastric ulcer, and complete clearance of the perigastric lymph nodes is very important in gastric cancer surgery.