1, postoperative patients protein intake 60-120g/day, and the reference intake of the diet is 10-35% of total energy indicates the range of protein acceptance. 2.Calcium element 1200-2000mg, also supplement with vitamin D if necessary, calcium citrate preparation is preferred because this salt is more easily absorbed in the absence of gastric acid. Beijing Hospital General Surgery Department Song Jinghai 3, RYGB postoperative due to reduced digestion of protein-binding cobalamin and absorption of the required endogenous factor vitamin B12 complex formation disorders, prone to vitamin B12 deficiency, should be supplemented with vitamin B12. 4, malabsorption of fatty diarrhea after surgery prone to fat-soluble vitamin deficiency, such as vitamin A deficiency, can be oral vitamin A 5000-10,000IU/d until vitamin A recovery. BPD and BPD/DS are prone to vitamin K deficiency, and oral and intramuscular vitamin K injections are required when INR is greater than 1.4. 5. Iron deficiency is common after Roux-en surgery, and iron supplements and vitamin C are required. 6. Patients who are prone to vitamin B deficiency due to duodenal bypass or frequent vomiting, such as those with obvious neurological symptoms, should take parenteral supplementation of vitamin B (100mg/d) and change to oral preparation after 7-14 days until the neurological symptoms are relieved.