For babies with spastic cerebral palsy, super-selective posterior nerve root dissection (SDR) is performed. A surgical incision of about 5 cm is made in the middle of the lumbar region of the baby’s back, and the abnormal nerve fibers that induce muscle spasm are found and selectively disconnected using an intraoperative neurophysiological monitor, in order to reduce muscle tone in the lower limbs and enhance the effect of postoperative rehabilitation training. The baby’s muscle tone can be significantly reduced on the day after surgery, the ankle joint will be significantly relaxed, and the dorsum of the foot can be bent smoothly. Moreover, the muscle tone does not rebound after SDR surgery, and the child will be able to stand up and walk if systematic rehabilitation is carried out again.