We have observed 74 cases of radiolucent foreign bodies in food and air passage in E.N.T. department of our hospital, from Jan. 1972 to Mar. 1983. The following result was obtained. 1) Distribution of location was 56 cases (75.6%) in food passage and 18 cases (24.4%) in air passage. 2) In age distribution, 46 cases (82.1%) of foreign bodies in food passage were found in patient over 21 years old and 12 cases (66.7%) of foreign bodies in air passage were found in patient under 5 years old. 3) Females seems to be more frenquently involved than male in cases of foreign bodies of food passage and in cases of air passage, male is more frequent. Food passage male : female - 25 : 31. Air passage male : female - 10 : 8. 4) Meats was most frequent foreign body in food passage (19 cases-33.9%) and the bony pieces was next (17 cases-30.4%), plastic material was most frequent foreign bodies in air passage (9 cases-49.9%), and the vegetable seed was the second. 5) In the location of foreign bodies in food passage, the first narrowing of the esophagus was most frequent in air passage, the bronchus-especially right bronchus was the most frequent site. 6) In the duration of lodgement, 44 cases (78.6%) of foreign bodies in food passage were visited within 24 hours, and 11 cases (61%) of foreign bodies in air passage were visited within 24 hours. 7) Simple chest PA was checked in all patient and then esophagogram was checked in 34 cases of foreign bodies in food passage, among them positive finding was noticed in 23 cases. 8) Removal of foreign bodies in food passage by esophagoscopy was performed in 54 cases (96.4%), but in the cases of air passage, removal of foreign bodies by bronchoscopy was performed in 14 cases (77.8%). 9) Complications of food passage by the foreign bodies itself or esophagoscopy were esophageal mucosal laceration (1 cases-1.8%) and esophageal perforation (1 case-1.8%) and complications of air passage by foreign bodies itself or bronchoscopy were atelectasis (2 cases-11.1%) and pneumonia (3 cases-16.7%).