The recurrence rate of stage I rectal cancer is very low, usually below 10%. stage I rectal cancer indicates that the patient’s rectal tumor is very early, usually invades into the mucous membrane layer or submucous membrane layer, and does not invade into the muscular layer, and there is no metastasis of lymph nodes, and the survival rate of 5 years is very high, usually 90%-100%, which means that the probability of recurrence is below 10%. after surgery, there is no chemotherapy needed, and regular checkups in the hospital are enough. After surgery, stage I rectal cancer does not need chemotherapy, and it is enough to come to the hospital for regular checkups. Usually, it is necessary to do colonoscopy every year, focusing on whether there is any recurrence of anastomosis or whether there is any reappearance of tumors elsewhere within the whole colon, that is to say, there is the possibility of heterochronous multiple source of tumor. Because after all, there is the possibility of recurrence, so it is also necessary to follow up for five years, after five years basically can be a little longer interval to the hospital for examination.