There have been many advances in the method of general anesthesia during bronchoscopy. Since 1967, when Sanders published a paper showing the Venturi principle for ventilating bronchoscopy, this technique has been popular. The advantage of this technique include easily visualization of the larynx and good access for surgical manipulation. But disadvantage include intermittent inadequate oxygen ventilation, danger of blowing foreign body to respiratory tract and damage of alveolus in children or elderly patient by excess high pressure. In our study, nine patients presenting for bronchoscopy were ventilated with the Venturi system from March to September, 1983. The patients were bronchoscopied with a Dosel-Huzley rigid bronchoscope. The results were as follows : 1) Age of the patient varied from 2 year to 53 year old and sex ratio was 7 : 2. Preoperative diagnosis were tracheal stenosis(6), subglottic edema(2) and subglottic granuloma(1). 2) PaO₂ was maintained well during bronchoscopy(286 mmHg) and postanesthetic stage(125 mmHg) compared preoperative stage(87 mmHg), but average PaCO₂ was slightly increased than preoperative value(4 mmHg). In conclusion, the use of injectimer was effective method in ventilation during bronchoscopy.