Liver abscess surgery has been low fever is generally considered to be caused by the infection is not effectively controlled. Liver abscess itself is a bacterial infection, which can cause systemic inflammatory reaction, high fever and chills. After liver abscess surgery, the bacteria in the body can not be completely removed immediately, if the abscess drainage is not adequate, residual pus or bacteria can continue to cause fever. Persistent fever may also occur when a liver abscess causes or develops an abdominal infection after surgery, or in combination with other infections (e.g., lung infection). Abdominal ultrasound, CT, blood routine, bacterial blood culture and other tests should be improved, and antibiotic anti-infection treatment should be actively applied, and combined and adequate medication is recommended. Regularly change the medicine, check the wound, and observe whether the drainage tube is clear. Strengthen nutritional support therapy. Postoperative persistent fever needs timely and active treatment to avoid serious complications.