Colorectal cancer does not necessarily require fistula surgery.1. Some patients with colorectal cancer must undergo fistula surgery, colorectal cancer with obstruction, serious intestinal dilatation, and more intestinal feces accumulation, this kind of patient is not suitable for anastomosis, because once anastomosis is done, the risk of anastomotic fistula is relatively high, and feces, if fistula to the abdominal cavity, will cause severe abdominal infection, resulting in patient death.2. Some patients with low tumor location, such as rectal cancer patients, need to do combined abdominal perineal resection, and need fecal excretion port, this kind of patients need to do ostomy.3. For example, patients with rectal cancer need to do combined resection of abdominal perineum, which requires fecal excretion port, and this kind of patients need to do stoma.3. Some patients need prophylactic stoma, such as the application of ultra-low anus-preserving technology, because of the high risk of anastomotic fistula after operation, prophylactic stoma can be done in the small intestine, and in the future, three months to half a year after the operation, the second operation can put the small intestine into the abdominal cavity again.4. For the remaining patients with colorectal cancer, if the pre-operation conditions are better and the bowel preparation is good, there is no need to do colostomy.5. According to different tumor location and size, the surgery varies from person to person. If there are patients with advanced tumors, the tumor can not be resected, and there are more metastases in the abdominal cavity, this kind of patients have to do colostomy, because the surgery is only to improve the patient’s quality of life, and it is not necessary to remove the tumor completely, and at the same time, it is impossible to remove the tumor.