During operation the maintenance of body temperature is helpful to reduce some risks and complications such as postoperative cardiovascular disease and infection. In this study, some warm air was utilized as medium and transferred into the part of the protective blanket, where was not in surgical region. This method was used to achieve the maintenance of body surface temperature of patients. In the prototype trials of 136 patients, experimental result showed that the body temperature of patients could be effectively maintained. This study would provide a new method and means to promote patient’s postoperative rehabilitation.