It is possible to change back one year after rectal cancer surgery when the lesion is gone and the anus is still there. Rectal cancer is a kind of malignant tumor, usually in six months to one year after surgery, it is possible to change back to the original state, but the prerequisite is that the rectal function has been restored better and the patient’s anus is still there. Usually, rectal function needs to be tested before rerouting after surgery for rectal cancer, if the test finds that the rectal resting pressure, intrarectal pressure and rectal pressure can return to normal value, surgery can be performed. After rerouting, some patients are unable to hold their bowel movements due to the lack of recovery of anal function after prolonged surgery, which may affect the quality of life. Such patients need to perform anal lifting exercise to restore anal function. After rectal cancer surgery, patients need to keep the area around the anus clean and tidy, pay attention to light diet and avoid spicy and stimulating food. Whether the patient can change the anus back in specific cases should be carried out according to the doctor’s instruction after examination and evaluation by professional doctors.