The authors have performea clinical and statistical analysis on 23 patients who were suspected of airway foreign bodies and treated by ventilating bronchoscopy among 41 cases of ventilating bronchoscopy performed from September 1985 to March 1988. The results were as follows : 1) Among the 23 cases, 20 cases(87.0%) were under the age of 4. The ratio of male and female was 6.7 : 1. 2) By frequency of presenting symptoms and signs, coughing was the highest(69.6%) followed by dyspnea, asthmatoid wheezing and fever. 3) Vegetable foreign bodies, especially nuts, were the most common airway foreign bodies(70.6%) followed by plastic foreign bodies(17.6%) and metal foreign bodies(11.8%). 4) By distribution of the location of foreign bodies, 10 cases were located in the main bronchus(7 cases in the left and 3 cases in the right), and 6 cases were in the trachea. 5) Abnormalities in chest X-ray were found in 15 cases(88.3%) among 17 cases. All vegetable foreign bodies revealed abnormalities in chest X-ray. 6) By duration of lodgement in the airway, 8 cases(34.8%) was removed within 24 hours, 6 cases(26.1%) over 7 to 30 days, and 4 cases(17.4%) over 30 to 60 days.