As a result of the reconstruction of the anastomosis of the gastrointestinal tract after most of the stomach has been removed, this causes some changes in physiological functions, such as a smaller gastric cavity, less opportunity for mechanical agitation of food, less production of digestive juices, irrational reflux of some digestive juices, and food often entering the jejunum too quickly. Therefore, scientific adjustment of diet is both an active post-surgical treatment and an essential health care measure. Otherwise, it may easily lead to serious post-surgical complications such as post-surgical gastrointestinal anastomotic ulcers, residual gastritis, and even residual gastric cancer. Generally speaking, early post-surgery must strictly follow the principles of few meals, light, soft, high protein, low fat, low sugar, avoid cold, spicy, and acid: 1, try to use the slower emptying of viscous, easily digestible food. Little and many meals gradually increase the quality and quantity in the diet according to the absorption situation. After surgery, eating more meals can ensure that the gastrointestinal tract can be easily emptied and can be fully rested. Of course, there is a limit to the number of meals, usually 4-6 meals per day is appropriate, each meal to 1/3-1/4 of the amount of gastric surgery before the degree, dinner should be less to ensure that the residual stomach has sufficient emptying rest time. 2. Choose a low-fat, light and soft diet. Low-fat diet can prevent fatty diarrhea which is common after surgery. Low-sugar diet can reduce gastrointestinal distension caused by sugar fermentation and make up for the reduced digestive power caused by reduced secretion of digestive juices and non-physiological reflux. 3, it is advisable to supply high protein, high calorie, low carbohydrate, less residue, easy to digest food. After most of the stomach is removed, many patients will have the sequelae of malnutrition in the short term, so it is necessary to strengthen the protein intake, pay attention to the supplementation of various vitamins and iron, potassium, sodium and chlorine; use less monosaccharides and disaccharides to prevent inducing dumping syndrome. In addition, lying down for about 30 min after eating has a better effect on preventing the occurrence of dumping syndrome. 4.Patients after gastrectomy should also pay attention to the appropriate addition of calcium and vitamin D in the diet, which is conducive to the prevention of bone calcification. 5, in the cooking method should pay attention to the use of cooking, braising, steaming, stewing and other cooking methods as far as possible, rather than using cold, fried, raw and other methods, in order to facilitate the digestion and absorption of food.