Objective To compare combined warming method and a forced-air warming system for rewarming of patients developing mild hypothermia postoperatively. Methods A total of 90 patients were randomly divided into two groups, with 45 patients in each group.The intervention group was rewarmed using a combination of a thermal reflective blanket and a cotton quilt, while the control group was rewarmed using a forced-air warming system. Results The mean effect difference after rewarming between the two groups did not reach the non-inferiority boundary.There was no statistically significant differences in terms of thermal comfort, as well as the incidence rates of shivering and adverse cardiovascular events in both groups （all P＞0.05）. Conclusion Combined warming method is on a par with forced-air warming in terms of rewarming efficiency.Likewise for the outcomes of thermal comfort and safety.It could be applied to postoperative patients with mild hypothermia.