Ulcerative colitis is a non-specific inflammatory bowel disease. It is mostly found in the sigmoid colon of the rectum, with a continuous distribution that may extend to the descending and transverse colon, and rarely involves the entire colon. The main intestinal symptoms are abdominal pain and diarrhea with mucopurulent stools. Extra-intestinal manifestations include fever, malaise, wasting, arthralgia, and iritis. Common complications include massive blood in the stool, toxic bowel dilatation and colon cancer. Patients with bowel disease often suffer from malnutrition due to reduced intake and impaired absorption and inflammatory depletion. Good nutrition can restore the natural defenses of the intestine. The following are recommendations for the diet of patients with ulcerative colitis. First of all food selection, it is advisable to have food refined rice and noodles, lean meat, fish, eggs, mashed vegetables, etc.; prohibited foods milk, coarse grains, dry legumes, fatty meat, animal oil, vegetables and fruits (prohibited during acute attacks), chili, pepper, mustard, all kinds of fried foods. The following foods may cause relapse or aggravation of the disease: corn, wheat, potatoes, tea, coffee, apples, mushrooms, oats, chocolate, dairy products and yeast. The caloric requirement should be estimated at 25-35kcal/kg.d for adults, protein requirement is usually 1-1.5g/kg.d for adults, and parenteral nutritional support can be considered for insufficient enteral nutrition in the acute stage. Next, attention should be paid to trace elements and vitamins. Patients with chronic blood loss, positive fecal occult blood, resulting in iron deficiency, need frequent iron supplements, either oral iron dextrose or iron injection. Persistent diarrhea can cause zinc deficiency, which can be supplemented by zinc sulfate or multivitamin and trace element preparations. Patients taking steroids need to supplement with 1000-2000 mg of calcium daily to reduce bone loss. Patients on long-term oral steroids are tested for BMD and reduced phosphate therapy can be considered. In conclusion, appropriate nutritional support therapy can enhance the benefits of drug therapy to reduce the symptoms of active disease.