Rectal cancer is prone to intestinal obstruction because the rectum is the organ for storing stool, and when there is a tumor in the rectum, it is easy to cause rectal obstruction, which results in the inability to pass stool. When acute intestinal obstruction occurs, it is necessary to do rectal fistula, the location of rectal fistula is mostly in the upper left abdomen above the abdominal wall, after dissecting the colon and rectum, the colon will be opened from the attached wall, so that the stool can be discharged from the abdominal wall, and then radical radiotherapy or radical surgical resection can be done for rectal cancer. If the condition is stabilized, the colorectal fistula can be returned to the intestinal cavity, which can help to improve the patient’s quality of life. Therefore, once colorectal cancer is combined with acute intestinal obstruction, colorectal fistula is often needed.