Sevoflurane anesthesia in children is a prefer ed anesthetic agents, But it has obvious side ef ects that the higher incidence of emergence agitation. Dexmedetomidine is a new a2 receptor agonist with sedetation, analgesia, without respiration depression and antianxiety ef ects, it wil be a good way to solve the problem of emergence agitation . dexmedetomidine wil obtain bet er ef ect no mat er what way it give to the patients.%七氟烷对于小儿全身麻醉是一种优选的全身麻醉药，但它明显的副作用在于较高的苏醒期躁动的发生率。右旋美托咪定作为一种新型的 a2受体激动剂因且有较强的剂量依赖性的镇静、镇痛、抗焦虑且无明显呼吸抑制等作用可以很好的解决这一问题。右旋美托咪定以不同的方式给予患者，都会得到较好的效果。
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