Patients with rectal cancer, if the lesion is relatively close to the anus, less than 5cm, can choose the abdominal perineum combined with radical resection of rectal cancer, which requires abdominal wall fistula, that is, removal of the anus, which is a type of late staging, and the survival time after surgery varies from 1-3 years. Each individual has significant differences. After surgery, systemic intravenous chemotherapy is also required, mainly fluorouracil and oxaliplatin combined with calcium folinic acid are chosen for intravenous chemotherapy, which requires 4-6 cycles of chemotherapy. Changes in blood and internal environmental parameters should be monitored during treatment. The purpose of complementary therapy is also to prolong the survival time of the patient, as there are many patients who can significantly benefit from the chemotherapy process and alleviate late stage suffering.