Malnutrition is the most common complication of inflammatory bowel disease. Long - term malnutrition could lead to serious outcome and increase the burden of the patient. Individual diet and nutritional support are the main ways to improve malnutrition. Diet may be a potential inducement of the disease. Because the types of diet were complex，so the effect of diet on the disease has not been clear. Nutritional support therapy has become an important treatment for induction and maintenance of remission. In recent years，significant progresses have been made in support methods at home and abroad. Therefore，this review summarized the nutrition risk screening，diet management，nutritional support and nutrient selection，aiming to improve Crohn’s disease nutrition therapy.