The common types of gastric cancer can be divided into mass type, limited ulcerative type, infiltrative ulcerative type and diffuse type according to the size of tumor form. If to be divided according to the location of tumor, it can be divided into cardia, sinus, gastric body, gastric horn and so on. If the tumor is differentiated, it can be divided into highly differentiated adenocarcinoma, moderately differentiated adenocarcinoma, hypofractionated adenocarcinoma, or mucinous adenocarcinoma, indolent cell carcinoma, etc. The more common complications after gastric cancer surgery are: firstly, it mainly includes bleeding, which may be abdominal bleeding, or bleeding from the anastomosis, that is, bleeding inside the gastrointestinal tract. Secondly, there is a possibility of anastomotic fistula, such as esophageal small bowel anastomotic fistula, duodenal anastomotic leak or gastrojejunal anastomotic leak, etc. Then, there is also a tendency to develop residual abdominal infection, because after the accumulation of fluid in the abdominal cavity or after the development of fistula, there is a possibility of secondary bacterial infection and the patient develops abdominal pain, abdominal distension, fever, etc.