Transcatheter embolization of bronchial arteries and non-bronchial systemic collaterals appears to be a well accepted means of accomplishing temporary or permanent hemostasis in management of massive or chronic recurrent hemoptysis. We have performed 37 embolization procedures on 31 hemoptysis patients at our hospital through the period of July 1986 to December 1987 (18 months). The results were as follows: 1. The causes of hemoptysis were pulmonary tuberculosis(22cases) bronchiectasis (7 cases) aspergillosis (1 cases)and chronic bronchitis(1case) 2. The embolized vessels reponsible for hemoptysis were the bronchial arteries 39 (57.5%) and/or the non-bronchial systemic collaterals 30 (43.5%) 3. Rebleeding occurred in 6 out of 15 cases of chronic recurrent hemoptysis in 3 out of 5 cases of massive hemoptysis of over 600 ml per day and occurred most often within 2 weeks after embolization. 4. A to fifteen month follow-up showed no further hemoptysis in 26 cases, The success rate of these em-bolization procedures was therefore 83.9%