Introduction: Unexpected hypothermia in surgical patients is a common problem. Among 52 medical centers surveyed in Germany, even if 90.4% used thermal insulation measures, there was still a 53.5% incidence of hypothermia . In Taiwan, the quality of body temperature care has not yet been determined. In the hospital where the author serves, the incidence rate of hypothermia among patients during the entire operation period is 35.4%. In order to effectively reduce related complications and protect surgical patients from normal body temperature throughout the operation period, the NICE care principles are applied to surgical patients to construct a suitable maintenance system for surgical patients throughout the operation period. The principle of normal body temperature care reduces the rate of unexpected hypothermia and improves patient safety and quality of care.