Fistulation is a selective operation, which refers to the establishment of a channel by artificial means to temporarily or permanently change various functional disorders caused by the primary disease in order to carry out other surgical treatments. For example, colostomy is to take a colon out of the abdominal wall and make a permanent or temporary fecal outlet. Gastrostomy is to establish a passage between the front wall of the stomach and the front abdominal wall to solve the nutritional problems of some patients. The specific indications of this operation are related to the type of fistula, as is the recovery time.