Ulcerative colitis is one of these “persistent diseases” that requires long-term treatment, so nutrition and diet are important. Ulcerative colitis is a chronic inflammatory disease of the rectum and colon of unknown origin. Diarrhea, abdominal pain, and mucus and pus in the stool are common symptoms of ulcerative colitis. The stools are 2 to 4 times a day, or up to 10 times or more in severe cases. The disease varies in severity and is recurrent or prolonged with a chronic course. Patients are often malnourished, lean and anemic. The general principle of the diet of ulcerative colitis is high calorie, high protein, high vitamin, less oil and less dregs diet. Therefore, the patient’s diet should ensure sufficient calories, proteins, inorganic salts and vitamins to avoid malnutrition as much as possible, in order to strengthen the body and facilitate the remission of the disease. In addition, there are four taboos that need to be noted: First, eat less coarse fiber food: avoid choosing coarse fiber food and processed rough food. Because a large amount of coarse fiber food will stimulate the intestinal tract, and affect the absorption of nutrients, the original malnutrition of the patient will aggravate the disease. Therefore, food fiber should be limited as much as possible, such as leeks, celery, white potatoes, radishes, coarse grains, dry beans, etc. Raw vegetables and fruits should be avoided during the active period of the disease, and can be made into vegetable water, vegetable puree, juice and fruit puree for consumption. Do not cook with large pieces of meat, but often use minced meat, diced meat, shredded meat, minced meat and steamed egg custard, boiled eggs and other forms. Milk and dairy products are also not recommended during the active phase of the disease. In the process of dietary regimen, patients and their families should pay attention to the condition: which foods work well for patients, and which foods patients feel uncomfortable or have allergic reactions after eating. Should summarize the experience in a timely manner, and continue to explore the appropriate diet. Do not eat too cold or too hot food either. In summer, especially to avoid eating cold drinks and food just taken out of the refrigerator. Fourth, should not eat too much greasy food: ulcerative colitis diarrhea is often accompanied by fat malabsorption, severe cases with steatorrhea. Therefore the amount of dietary fat should be limited, should use less oil food and less oil cooking methods. For those with steatorrhea, medium-chain fatty acid fats, such as coconut oil, can be used. It is not advisable to eat oily food and fried food when you have diarrhea, and you should cook various dishes with as little oil as possible, and often use methods such as steaming, boiling, stewing, blanching, stewing and water-slide. In short, patients with ulcerative colitis should choose soft, light, less residue, easy to digest, rich in nutrients, have enough calories food, a small number of meals, in acute episodes and outbreak type cases, severe cases should be fasting in the first few days, available intravenous high nutrition therapy, so that the intestine to rest, after the symptoms improve, can gradually transition to fluid, no residue or less residue semi-liquid, etc..