Rectal cancer needs to be reviewed regularly to determine whether there is recurrence and metastasis of rectal cancer, so that problems can be detected and dealt with in time. Generally, CT of chest should be done regularly to check whether there is lung metastasis and mediastinal lymph node metastasis, CT of upper abdomen or ultrasound of liver, gallbladder, pancreas and spleen to determine whether there is liver metastasis, and CT or MRI of pelvis to check whether there is metastasis of pelvic lymph nodes. It is also necessary to have a pelvic CT or MRI to see if there are metastases in the pelvic lymph nodes. It is also necessary to have an electronic colonoscopy to see if there are recurrent or new tumors in the intestine.