Rectal cancer lymph node metastasis can be controlled by chemotherapy after surgery. Through chemotherapy, the remaining tumor cells can be further killed and the cure rate can be improved. When lymph node metastasis occurs in rectal cancer, lymph nodes need to be cleared during surgery, and chemotherapy can be chosen to control it after surgery; the main purpose of chemotherapy is to kill the remaining tumor cells, reduce the probability of recurrence and metastasis as much as possible, and improve the clinical cure rate of surgery. During the postoperative recovery period, we should pay attention to regular imaging and blood tests to determine the condition of the tumor. Once abnormalities are found, we need to consult the doctor in time and carry out standardized treatment under the guidance of the clinician, so as to avoid delays in the condition of the tumor.