Objective To analyze the preventive effect of different warming methods on hypothermia during laparoscopic appendectomy（LA） in children. Methods A total of 120 children who underwent LA in the First People’s Hospital of Shangqiu from January to December 2021 were analyzed retrospectively. The children were allocated to the routine group

pneumoperitoneum group

and warm air group following the warming method

with 40 cases in each group. Participants in the routine group

the pneumoperitoneum group

and the warm air group were warmed by the conventional pneumoperitoneum machine

photoelectric warming device of the warmed pneumoperitoneum machine

and warm-air machine while the pneumoperitoneum was established

respectively. Intraoperative body temperature（at admission

during the establishment of pneumoperitoneum

30 min after the establishment of pneumoperitoneum

and end of surgery）

heart rate（HR） changes

Echelle Douleur Inconfort Nouveau-Né（EDIN） scores and postoperative complications were compared among the three groups. Results There was no significant difference in the body temperature between the three groups at admission and during the establishment of pneumoperitoneum（P>0.05）; there was no significant difference in the body temperature between the pneumoperitoneum group and the warm air group at different time points（P>0.05）. The body temperature at 30 min after pneumoperitoneum establishment and at the end of surgery was higher in the pneumoperitoneum group and the warm air group than in the conventional group

and the body temperature at the end of surgery was lower than that at admission

during the establishment of pneumoperitoneum

and 30 min after pneumoperitoneum establishment in the conventional group

while the body temperature at the end of surgery was higher than that at admission

during the establishment of pneumoperitoneum

and 30 min after pneumoperitoneum establishment in the pneumoperitoneum group and the warm air group

all with were statistically significant differences（P<0.05）. There was no significant difference in HR between the three groups at admission and induction of anesthesia（P >0.05）; there was no significant difference in HR between the pneumoperitoneum group at different time points（P>0.05）. HR at the end of surgery was significantly lower in the pneumoperitoneum group than in the conventional and warm air groups（P<0.05）. The EDIN scores of children in the pneumoperitoneum group were significantly lower than those in the conventional and warm air groups after extubation and when they came out of the anesthesia recovery room（P<0.05）. The incidence of chills in the conventional group was significantly higher than that in the pneumoperitoneum group and the warm air group（P<0.05）. Conclusion In pediatric LA surgery

the use of pneumoperitoneum warming and warm-air machines can prevent intraoperative body temperature decrease and effectively reduce the risk of chills and hypothermia; however

compared with warm-air machines

pneumoperitoneum warming has a smaller impact on the heart rate of children yet with higher comfort.