Therapeutic bronchoscopy took on new dimensions with the addition of laser technology in the early 1970's. Tissue destruction could be obtained without bleeding by the use of laser and better visual field made the endoscopic operation more precise and definitive. This technique was first reported by Polanyi in 1970 and got popularity by the development of ventilating bronchoscopy. In 1982, universal endoscopic coupler was developed and it made the laser bronchoscopic surgery more simple and safe. In our department, CO₂ laser bronchoscope has been used since 1988 and endotracheal mass lesions and stenotic lesions were treated by this method. We found that laser bronchoscopic technique was very useful, so we report our experiences in CO₂ laser bronchoscopy and treatment results of endotracheal lesions.