Inclusion Criteria:  ① Endoscopic radical resection of lung cancer was performed with a single or porous approach.② Continuous monitoring of nasopharyngeal temperature was recorded during the whole operation (the system automatically recorded once every 5min);③ The preoperative basal metabolism was normal, and the basal body temperature was 36.5℃<T0<37.5℃ (the preoperative average body temperature in hospital);(4) total subvenous tracheal intubation anesthesia;  Exclusion Criteria:  Patients with the minimum intraoperative temperature monitoring data >36.0℃;Cases with warm intervention immediately after the start of surgery;Patients undergoing combined surgery for other types or organs;Intraoperative monitoring of body temperature was discontinuous or abnormal (monitoring catheter was accidentally pulled out, etc.);Intraoperative endoscopic change cases;Other cases that do not meet the requirements of the study, such as individual data anomalies or cases that are far more specific than the general cases (the cases themselves are special or caused by human recording errors).