If the patient has gastric cancer in the sinus part of the stomach, the distal stomach is usually operated radically, the lower 3/4 of the stomach is removed and the upper 1/4-1/3 is preserved, and after the operation, the stomach, small intestine or stomach and duodenum are usually sutured together. If the residual stomach is directly anastomosed with the duodenum, it is called a Bi1 anastomosis, and if the residual stomach is anastomosed with the jejunum, it is generally called a Bi2 anastomosis. The Bi1 anastomosis is closer to the normal physiological structure of a person, and the reaction inside the stomach is generally milder after the surgery, and rarely leads to reflux esophagitis. If a Bi2 anastomosis is performed, complications such as dumping syndrome, reflux esophagitis, or anastomotic inflammation may occur after the surgery.