This study was undertaken to evaluate the result of intensive respiratery care for 36 patients who developed acute respiratory insufficiency and pulmonary comlications after operation in Busan National University Hospital, and to compare the any difference between the survivors and nonsurvivors. The results were as follows : 1) 20 patients survived (55.6%) . 2) In 19 patients(52.8%) , were received prolonged cancer operation and upper abdominal surgery. 3) 30 patients had abnormal physilogic conditions before operation, in which the COPD was the most oommon problems. 4) 55% of aurvirors had mean operation time less than 5 hrs and 75% of non survivers had mean operation time greater than 5 hrs. 5) In 83.3% of patients, acute respiratory Compiication was developed within 10 hours from the opration, 6) Majority of the Patients (25/69.4%) required less than 24 hrs of ventilatory support. 7) 29 patients, receive the PEEP therapy and the level of PEEP was 6~15 cmH2O. 8) The survivors showed fair general conditions during respiratory care, such as normal range of blood preasure, more improved pulmonary function, more improved atterial blood gases and CVP, and adequate hourly urine output. But the nonsurvlvors had poor general conditions, such as unstable blood pressure, poor pulmonary function, abnormal arterial blood gases in spite of ventilatory support, low urine output, high CVP, and elctrolyte i mbalances.