High frequency jet ventilation (HFTV) was experimentally studied to ensure intraoperative respiratory support at tracheo-bronchoplasty. On the condition of driving pressure of 5 to 15 PSI and frequency of 100 to 400 during bronch-plastic procedure, HFJV is of great help to shorter the operation time and to secure the anastomosis. And the arterial Po2 and Pco2, and pulmonary hemodynamics were kept satisfactory in the circumstances of intraoperative respiratory support