The reasons considered for recurrent fever after appendicitis surgery include inflammation of the appendix site, infection of the abdominal cavity, and infection of the incision site. 1. Inflammation of appendix: due to severe inflammation with gangrene or perforation, causing serious infection in the abdominal cavity with accumulation of pus, all the pus is not cleaned up during the operation, there are leftovers, resulting in repeated fever after operation, giving oral or intravenous cefoperazone to fight infection, actively draining the pus, and performing surgical treatment if necessary. 2. Abdominal infection: the appendix root is fragile in texture, and there is fecal leakage after operation, which causes abdominal infection and leads to repeated postoperative fever. 3. Infection of incision location: postoperative fever is caused by infection at the incision location, in this case, we should increase the frequency of wound dressing change, give anti-infection treatment such as ofloxacin, and if necessary, make an incision at the incision location to drain the pus. Repeated postoperative fever consider the possibility of infection, active anti-infection treatment, if necessary, surgery.