Class II surgical incisions mainly include radical surgery for various gastrointestinal tumors, such as radical surgery for gastric cancer, radical surgery for intestinal cancer, or other benign diseases of the gastrointestinal tract, such as gastric repair, intestinal repair, partial resection of the stomach, partial resection of the small intestine, and appendectomy. Class II surgical incision is defined as an incision that may be contaminated because the gastrointestinal tract contains a large number of bacteria, which may contaminate the surgical incision and cause bacterial infection during the surgical procedure, especially during the process of specimen retrieval, so it is called a Class II incision. Class I incisions are usually sterile incisions, mainly on the surface of the body, such as thyroid breast, saphenous vein or inguinal hernia surgery.