1. surgical method The lesion was initially localized according to preoperative imaging data, and the surface of the lesion was observed intraoperatively microscopically to verify the location of the lesion and confirmed by palpation, according to which a reasonable extent of resection was designed. The lung segments were resected using the bronchial localization method [1], and the intersegmental separation was performed using a linear cutting suture closure method. After dissection from the hilum, the bronchial artery and vein were severed, the target bronchus was established, the lung was clamped and then expanded, and the lung was closed by cutting along the non-distended pulmonary junction instrument. The lung section is sprayed with biologic adhesive to prevent air leakage. For those with preoperative diagnosis or intraoperative frozen section confirmation of lung cancer, groups 11-13 lymph nodes were removed at the same time as the lung segment was dissected, followed by sampling of the hilar and multiple mediastinal lymph nodes. All surgeries were completed successfully, with no perioperative deaths, and the operative time (43-300) min and intraoperative bleeding (50-600) mL, including 2 cases of dorsal segment of the left lower lobe, 2 cases of lingual segment of the left upper lobe (1 patient with branchial expansion underwent total thoracoscopic resection of the left lower lobe at the same time), and 1 case of intrinsic segment of the left upper lobe. The postoperative pathology suggested one case of pulmonary cyst, one case of tuberculosis sphere, one case of malformation tumor, one case of branchial enlargement, and one case of adenocarcinoma of the lung. 3, Discussion Lung segment resection requires solid basic surgical skills and rich experience in lobectomy, as well as intraoperative awareness of the three-dimensional anatomy of the lung and familiarity with the course and variation of each segment of the pulmonary artery and bronchus in the lung [2]. In order to facilitate exposure, the standard posterior lateral incision is required during routine surgery, which causes greater damage to the patient’s chest wall and brings disadvantages to postoperative recovery. In this group of cases, five surgeries were able to be completed successfully under full thoracoscopy, and the patients’ postoperative recovery was better than that of conventional surgery without increasing postoperative complications, demonstrating the promising application of thoracoscopy in lung segment resection. In our department, we started to carry out total thoracoscopic lobectomy in 2008, and with the maturity of lumpectomy technology, we began to try to carry out a variety of procedures under total lumpectomy that were all of high technical threshold under the original open surgery, and achieved initial results. One of the more common complications after lung segmental resection is air leakage in the lung section, and intersegmental separation is available by electrocautery or linear cutting suture closure. asakura et al [3] also tried a new method of lung section management, where they first separated the superficial lung tissue between segments with an electric knife and then closed the deeper tissue with a cutting suture in animal experiments, and the volume of residual lung tissue was significantly higher than that of the suture direct stapling of the lung tissue. We all use a linear cutting suture closure method with the residual surface sprayed with biological or chemical glue, which reduces the occurrence of postoperative air leaks, reduces postoperative time with chest tubes, and reduces complications. Segmental lung resection provides an excellent surgical tool in the management of low lung function, when the mass is close to the lung parenchyma or adjacent to the large vessels of the hilum that cannot be resected in a large wedge, and is especially valuable in patients with advanced stage IA lung tumors with a tumor diameter <2 cm (without extravasation and metastasis). There is no statistically significant difference in survival between patients undergoing segmental lung resection and lobectomy [4], and segmental lung resection is even superior to lobectomy in terms of postoperative complications, postoperative hospital stay, and other indicators. In conclusion, television thoracoscopic techniques can be used for lung segment resection, and intersegmental separation with a linear cutting suture can simplify the surgical steps. The lung segmental resection of malignant tumors supplemented with necessary lymph node dissection can conditionally be a reasonable option for the treatment of patients with low lung function and advanced lung cancer (stage IA lung tumors < 2 cm in diameter).