To explore the complications of long-term placement of Montgomery T silicone stent (Ttube) in the treatment of subglottic benign airway stenosis (SBAS) and the timing of successful Ttube removal. We retrospectively collected the clinical data of 32 patients with SBAS who underwent the treatment of Ttube and analyzed their placement and successful removal of the Ttube. There were 22 males and 10 females, aged from 21 to 79 years (60.9 ± 13.7 years). The Ttubes were successfully placed in all 32 patients, and 6 patients (18.8%) with mild stenosis were placed by the intravenous conscious sedation. The longest follow-up period was 60.4 months, and 17 patients (53.1%) had the Ttubes for more than 12 months; 5 patients (15.6%) were changed to the tracheostomy cannula after unplanned removal of the Ttubes for various reasons; the Ttubes were successfully removed in 9 patients (28.1%), and the duration of Ttubes placement was 5.2-22.7 months (12.1 ± 6.3 months), among them anatomical stenosis in 9 patients (100%). Secretion retention was observed in 32 patients (100%), granulation tissue hyperplasia was observed in 9 patients (28.1%), and the normal ventilation was not affected in most patients by bronchoscopic treatment and follow-up; the Ttubes were removed in 3 patients due to severe complications. There was no significant difference in the incidences of secretion retention and granulation tissue hyperplasia between the time point at 1 week, 1 month, 3 months, and 12 months, > 0.05. In patients with Ttube more than 12 months, the severity of secretion retention at 1 week, 1 month, 3 months, and 12 months was significantly different, < 0.05, however, there was no significant difference in the severity of granulation tissue hyperplasia, > 0.05. Ttube is safe and effective in the treatment of SBAS. The severity of secretion retention increased in patients with long-term placement of the Ttube. For patients with mild stenosis and anatomical stenosis, the Ttube removal can be attempted at about 1 year of follow-up.