The obstruction of food passage in the stomach is due to lesions such as ulcers or cancerous tumors. It can be divided into two main categories: incomplete obstruction and complete obstruction. Pyloric obstruction is one of the common complications of gastric and duodenal ulcers and can occur in the recent (i.e., active) or late stage of ulcer disease. The pylorus is the narrowest part of the digestive tract, with a normal diameter of about 1.5 cm, and is therefore prone to obstruction. Due to the obstruction of the pylorus passage, gastric contents cannot enter the intestine smoothly and are retained in the stomach in large quantities, resulting in hypertrophy of the muscular layer of the gastric wall, enlargement of the gastric lumen and inflammation, edema and erosion of the gastric mucosal layer. Clinically, the patient is unable to eat normally for a long time and vomits a lot, resulting in severe malnutrition, hypoproteinemia and anemia, and water and electrolyte disorders such as severe dehydration, hypokalemia and alkalosis. If the passage of food in the stomach is not improved by sedative and antispasmodic drugs and correction of water and electrolyte disorders, surgery should be performed. A transverse incision in the right upper abdomen is mostly used, in which the circular muscle of the pylorus is cut longitudinally after dissection without cutting through the mucosa, and then the severed muscle ring is separated so that the mucosa protrudes from the wounded edge, thus enlarging the pyloric opening and relieving the obstruction. The distal end of the incision on the mass should not exceed the duodenum in order to avoid cutting through and causing duodenal fistula.