Postoperative patients with fever should consider the following two points: First, postoperative patients may have low fever, which is a normal physiological phenomenon and does not require special treatment and will disappear on its own after 2-3 days after surgery. Secondly, if postoperative patients repeatedly have fever, the possibility of infection should be considered and active search for infection foci, such as lung infection and urinary system infection. Of course, the most common one is incisional infection. After looking for the foci of infection, we should actively treat anti-infection, and if necessary, we also need to improve the bacterial culture of secretion and choose sensitive antibiotics for anti-infection treatment. At the same time, if the body temperature is greater than 38°5, it should be treated with oral hypothermia, such as Merlin.