If there is fever after surgery, the temperature is less than 38.℃, and the duration is not long, it is a normal phenomenon, which is caused by the absorption of fluid from the body tissues, and it is called absorption fever. If the temperature rises more than 38.5℃ or more than 39℃ after surgery, it is considered to be an infectious disease, and the bacteria are different according to the different parts of the surgery. If it is an intra-abdominal surgery, such as stomach surgery, small bowel surgery, large bowel surgery, it is very likely to consider E. coli infection after the surgery. If fever occurs, anti-infection treatment is needed, and second-generation cephalosporins or third-generation cephalosporins, such as ceftazidime or cefoperazone, can be used for anti-infection treatment. At the same time, it is necessary to observe the color and volume of the abdominal drainage tube, and there is no intestinal fistula or anastomotic fistula.