In the recovery room, hypnosic was evaluated by OAA / S, and the satisfaction of patients was avaluated by VAS Result: Mean target concentration (mcg / ml) at losing awareness: 1.33±0.31 (0.6 - 2.0); LMA insertation: 3.64 ± 0.35 (2.6 - 4); intervene:: 3.87 ± 0.37 (3 - 5); recovery: 1.18 ± 0.31 (0.4 - 2.6); losing awareness time (second): 46.02±7.71 (34 - 78); recovery time (minute): 13.95±5.20 (7-35).