Due to the improvement of the overall medical standard nowadays, such as the delicacy of surgery, postoperative anti-infection treatment and nutritional support, there is no difference in the overall mortality rate between stage I surgery and stage II surgery. Stage II surgery has a higher probability of infection and incisional dehiscence because the intestinal canal is exposed. However, for patients with severe abdominal infections, poor general condition and severe underlying disease, second-stage surgery is safer.