A clinical observation was made randomely selected 30 of 78 cases of balanced anesthesia consist of Demerol, Valium and N₂O-O₂, inhalation, performed from January to March 1980 at Eul-Ji General Hospital, Seoul, Korea. After pre-oxygenation, all cases received 5 mg of d-Tubocurarine, 5 mg/Kg of thiopental sodium, orotracheal intubation was facilitated with l.5 mg/kg of succinylcboline chloride intravenously and N₂O-O₂, (2:1 L/min) inhalation was carried out with semiclosed circle absorber system and 1 mg/kg of Demerol and 0. 2 mg/kg of Valium were intermittently injected intravenously. 0.04 mg/kg of pancuronium bromide, 0.4 mg/kg of succinylcholine chloride intravenously or 0.1% succinylcholine chloride by way of dripping was given and maintained controlled respiration. The following results were observed; 1) Systolic blood pressure was decreased 6. 5% at 5 minutes following anesthesia initiated, and maintained initial pressure at 30 minutes, at the end of anesthesia, and in recovery room. 2) Diastolic blood pressure was increased 4. 5% at 5 minutes, 7. 9% at 30 minutes following anesthesia initiated, however maintained the pressure at the end of anesthesia and in recovery room. 3) Pulse rates were maintained 5 minutes. 3.7% increased 30 minutes following anesthesia was initiated, maintained same rates at the end of anesthesia and in the recovery room. 4) 26% of anesthetized patients required narcotics for pain up to 4 hours of staying recovery room. 5) Jerking movement and psychosis were not observed following anesthesia. 6) Respiratory assistance and antidotes were not needed for all patients.