Since the introduction of the concept of detachable balloon technique to occlude arterio-venous fistulas this technique has become the treatment of choice in the management of traumatic carotid cavernous fistulas(CCF). We tried the occlusion of fistula using detachable balloons in 30 consecutive cases of traumatic CCF and the result of our experience is reported. Transarterial approach with manually-tied latex balloons is tried in all cases and the fistulas were successfully occluded in 28 cases of all. In 20 cases internal carotid artery was preserved and the arterial lumen was oculded along with fistula opening in 9 cases . In rest of 2 cases surgical ligation was done because of procedure-related thromboembolism and incomplete occlusion of fistula. We experienced hemiparesis as a major complication in 3 cases . In one of them the sympom developed during occlusion tolerance test one just after insertion of guiding catheter into the internal carotid artery and in one case 2 days after the occlusion of internal carotid artery. In one cases the procedure was performed by the direct puncture of carotid artery because of the ligation of common carotid artery by previous surgery. It is suggested that the systemic heparinization during the procedure is indispensible and starting the proc-edure with No 9 balloon is comnsidered reasonable.