The laringeal mask airway (LMA) has been recently introduced in pediatric anesthesia as an alternative to the face mask or endotracheal intubation. In this study, the efficacy of LMA with 150 patients undergoing elective pediatric surgical operations was investigated. Anesthesia was induced with propofol 3 mg/kg (IV) and maintained with halothane 1.5%, oxygen 50%, and azot oxide 50% with assisted ventilation. Four different size of LMA ranging number 1-3 were used according to the body weight of the patient. Blood pressure, transcutaneous oxygen saturation and end-tidal carbondioxide values, and ECG of the patients were monitored. Three patients did not tolerated LMA and were intubated. A clear airway was ultimately achieved in 147 (98%) children. We conclude that LMA in elective pediatric surgery operations was a safe technique.