Introduction: amnesia is one of the most important goals in General Anesthasia. From the point of Psychological views, awareness in general Anesthesia is not desirable, and elimination of it, is necessary. Overiall 1% of all patients have awareness and it maybe 10% in some anesthesia techniques. There is not a precise statiscal survey about awareness in NLA. This study attempts to present a statiscal work. Methods: All of the 60 patients in this study were 20-45 years old, under spinal surgery and in class I-ASA. All of them have been taken 10 mg of Diazepam over the night before operation and 7ml/kg of Ringer solution has been administered in the operating room. (Group A): Neurolept anesthesia started with induction (Talamonale 0.1 ml/kg, Thiopental 5 mg/kg, Pancuronium 0.1 mg/kg), maintained with N2O-Fentanyl (50 µg/30 min).(Group B): Induction with (Fentanyl 1.5 µg Thiopenthal 5 mg/kg, Pancuroniom 0.1 mg/kg) and maintanence with (Halothane 0.6%, N2O, Fentanyl 50 µg/30 min) was administerd.Atype player was used during G.A. Patients were requested answer the questions in recovery room and 24 hour after anesthesia. Results: According to Z test, there is no significant difference in awareness between the tow groups studied. Also according to X2test, there is no significant difference in awareness between the tow groups studied. All cases of awareness were in 35-45 years of agr. Conclusion: In NLA the voice heard by the patient is not percieved unpleasant. According to results, awareness in NLA was not more comparred to the other anesthesia techniques. So NLA can be used as a safe technique with more advantage in Poor Risk patients and who needs wake up test during surgery.