Gastrectomy is required for various reasons, such as gastric cancer or bleeding and perforated gastric ulcer. Gastrectomy can be divided into partial gastrectomy, hemi-gastrectomy, major gastrectomy, near-total gastrectomy and total gastrectomy according to the extent of gastrectomy. Depending on the location of the resection, it can be divided into proximal gastrectomy, distal gastrectomy and total gastrectomy. After resection, the residual stomach needs to be reconstructed with the small intestine or the esophagus with the small intestine. To date, there is a great variety of reconstruction methods, nearly 70. Because of the variety of reconstruction modalities, no one modality is the absolute best. Patients after surgery often experience varying degrees of eating disorders, or bloating after eating, or abdominal pain, or diarrhea, or worse, dizziness, panic, cold sweats, and other manifestations of hypoglycemia. Therefore, how to eat, what to eat and when to eat are very important dietary habits for post-gastrectomy patients. Good eating habits can improve the eating and nutrition status of such patients to the greatest extent. 1. Eat less and more often. After surgery, the volume of the residual or substitute stomach is reduced to different degrees, and the ability of the stomach wall to tolerate diastole is also obviously limited, so a large amount of a single meal will cause abdominal distension after eating, leading to the patient’s fear of eating and reluctance to eat. Therefore, eat less and more meals, gradually increase the amount of a single meal is the principle of eating for such patients, this process often takes more than 2 years. 2, rather dry than thin. After gastric surgery, the pylorus is often removed, the removal of this part will cause food out too quickly, resulting in abdominal pain and diarrhea, serious cases will cause dumping syndrome. 3, rather salty than sweet. Sweet food will cause a large release of gastrointestinal pancreatic hormones such as gastrin and insulin, which also tend to cause dumping syndrome.