More than a year ago, the 22-year-old college student month after month began to intermittently cough, cough sputum, fever and other symptoms, initially thought it was a cold did not care about, take their own medication to reduce fever and other drugs, the symptoms did not improve. To the local hospital to check the chest CT, considered “left-sided pneumonia”, given symptomatic anti-infection treatment for about 1 week after the fever, chest pain symptoms have improved, but cough, cough sputum did not improve significantly. After checking her blood for positive T-cell spot test, she was considered to have left-sided tuberculosis and started to receive anti-tuberculosis treatment. Half a year ago, Yue Yue again reviewed the chest CT, which showed that the left main bronchus was occluded, accompanied by left lung atelectasis; bronchoscopy showed that the left main bronchus was narrowed, which was considered as “bronchial tuberculosis”. In the past 2 weeks, Yue Yue’s cough, sputum, chest pain and other symptoms gradually worsened, and she was transferred to our hospital for further treatment. After admission, tracheoscopic treatment was performed under general anesthesia. The upper part of the trachea was characterized by irregular scar stenosis with a stenosis of about 20%. The left main opening scar stenosis was about 80%, and an electrosurgical needle was given to electrocut the scar, and the lumen was widened after treatment compared with the previous one, with a stenosis of about 50%. The distal left main bronchus was completely occluded by granulation tissue. Repeated balloon dilatation and carbon dioxide freezing and thawing treatment were given there, and the distal pinpoint opening was seen with a stenosis of about 95%. Rondon (before treatment) Balloon dilatation Carbon dioxide freezing and thawing Rondon (after treatment) Left main distal (before treatment) Left main distal (after treatment) Tracheal tuberculosis refers to tuberculosis occurring in the mucous or submucosal layer of the trachea and bronchus, and is also known as endobronchial tuberculosis, which is mostly secondary to pulmonary tuberculosis. Studies show that about 50% of patients with pulmonary tuberculosis have combined bronchial tuberculosis. Without timely bronchoscopy, it is very easy to miss the diagnosis. For the treatment of bronchial tuberculosis, systemic anti-tuberculosis treatment is basic, and local drug application is also important. Transbronchoscopic intervention can remove the proliferating granulation tissue and necrotic material faster and better. Our patient belonged to the mixed type of tracheal tuberculosis stenosis. For scar stenosis, after performing electrosurgical needle to loosen the scar and balloon dilatation, the lumen can be effectively enlarged; carbon dioxide freezing can effectively inhibit the proliferation of granulation tissue, reduce scar healing and delay recurrence.