To study the effect of different doses of sufentanil on anesthesia induction and analgesia after tonsillectomy in children. According to the different doses of sufentanil used in anesthesia induction, the children were divided into 3groups. The vital signs during anesthesia, the recovery period of anesthesia and the complications after anesthesia were compared among the groups. The anesthetic effects and safety of sufentanil at different doses were discussed, which provided theoretical basis for clinical selection of the best drug dosage.