Ｏｂｊｅｃｔｉｖｅ　This study aims to evaluate the influence of BMI on intraoperative body core temperature(BcT) in patients undergoing laparoscopic gynecologic surgery and the effectiveness of different heat preservation measures.　Methods　Sixty women undergoing laparoscopic gynecologic surgery, aged 18-60 with an ASA classification of Ⅰ,Ⅱwere divided into 3 groups according to BMI (n=20): normal weight group (group N, BMI 18.5-22.9 kg/m2), overweight group (group O, BMI 23.0-24.9 kg/m2) and mild obesity group BMI(group L, BMI 25.0-29.9 kg/m2). Nasopharyngeal temperature probe was placed 10 min after anesthesia induction to monitor the BcT. The BcT was recorded at 10 min (T1), 30 min (T2), 60 min (T3), 120 min (T4) after anesthesia induction and at extubation after waking up (T5) respectively. Additionally, 40 women with BMI 18.5-22.9 kg/m2 undergoing elective laparoscopic gynecologic surgery were divided into 2 groups randomly(n=20): warm liquid group (group NA) and warm liquid+warm blanket group(group NB). After patients of group NA entered the operation room, 37 ℃ warm liquid was infused. For patients in group NB, the temperature?蛳adjusting blanket was preheated to 37 ℃ before patients entered the operation room, covering upper limbs and back of patient immediately after the patients entered the operation room. Meanwhile, 37 ℃ warm liquid was infused till patients were woken up and extubated. The BcT and other intraoperative parameters were recorded as the same as stated above.　Results　BcT of patients in group N were significantly decreased at T3 (P＜0.05). Furthermore, for patients in group O, BcT was significantly reduced at T4(P＜0.05). For patients in group L, the difference of BcT changes at different time points after anesthesia induction was not statistically significant (P＞0.05). Compared to patients in group N at the same time points, BcT of patients in group O at T4 and T5 was relatively high (P＜0.05). Patients in group M had higher BcT than group N at T2-T5 time points (P＜0.05). BcT of patients in group NA were decreased obviously at T4. For the patients in group NB, there were no differences in BcT at different time points (P＞0.05). Compared to subjects in group NA at the same time, BcT of patients in group NB was relatively high at T3-T5 (P＜0.05).　Conclusions　Patients with BMI 18.5-22.9 kg/m2 will easily suffer from intraoperative hypothermia during laparoscopic gynecologic surgery. Infusing warm liquid preheated to 37 ℃ and covering the upper limbs and back with a temperature-adjusting blanket preheated to 37 ℃ can significantly reduce the occurrence of hypothermia.