Malignant tumors have become a major killer of human health.The incidence of colorectal cancer increased year by year in China, especially in elderly patients with malnutrition and high incidence of anemia.But these situations are often neglected by clinicians and requiring the systemic treating standard.Nutritional risk screening and assessment for colorectal surgery patients should be carried out within 24-48 hours after admitted.The patients could benefit from better recovery after colorectal surgery, furthermore, they could suffer less complications and save more costs from reasonable perioperative parenteral and enteral nutrition support, especially from early postoperative enteral nutrition.Perioperative iron supplement is advocated for patients with iron deficiency anemia.It helps in protecting the patient's immune function, as well as reducing the risk of blood transfusion and related complications.Systemic perioperative nutritional support will benefit the colorectal cancer patients in surgical recovery, rehabilitation and prognosis.