When intestinal cancer patients undergo blood test, they mainly check blood routine, coagulation routine, tumor index, and also liver and kidney function. Blood routine is mainly to understand the changes of red blood cells, white blood cells, hemoglobin and platelets, and to understand whether patients have intestinal bleeding or bleeding from intestinal cancer rupture. During chemotherapy of intestinal cancer, it is necessary to focus on monitoring the white blood cells, because many chemotherapy drugs may cause the decrease of white blood cells. If tumor indexes are elevated, it means that tumor metastasis or recurrence may occur during chemotherapy or during the follow-up process, and further improvement of relevant examinations is needed to further clarify the diagnosis. If the patient’s liver function is abnormal, such as lower albumin, it indicates that the patient’s nutritional status is relatively poor recently, and should be increased if necessary.