When MRI is performed on a child with cerebral palsy, the child cannot cooperate and no metal objects, including monitors, can be placed in the MRI examination room, otherwise the MRI signal will not work; the anesthesiologist can only operate anesthesia and observe the condition from a distance outside the examination room. Therefore, the safety of the child during the MRI examination, the satisfaction of the MRI examination results, and the ability of the child to wake up and leave the hospital as soon as possible after the examination are some special problems. The details are as follows: ① Valtrex 0.01mg/kg; ② Midazolam 0.1mg/kg; ③ Ketamine 2mg/kg. Monitoring method: Monitor ECG and respiration with a special electrode piece for MRI (carbon electrode piece). Body position: a thin pillow under the shoulder.