The antispasmodic mechanism of SPR is to selectively cut off the muscle shuttle afferent class Ia fibers in the posterior spinal nerve root, reduce the peripheral excitatory afferents, so that the r-loop that regulates muscle tone, in the presence of brain damage, reaches a new relative balance of excitation and inhibition, thus relieving spasm and reducing abnormally elevated muscle tone. Characterized by precise surgical effect, not easy to recur, fewer complications and other advantages. Traditional surgical guidelines: 1, a certain degree of trunk and limb movement ability, independent walking ability and squatting ability, 2, muscle tone of Ashworth grade 3 or above, 3, mental ability is normal or close to normal, and 4, there is no obvious contracture and deformation of the joints. However, in our clinical work, we found that: 1. For spastic paralysis of the hemisphere. Research shows that the growth rate of skeletal muscle in spastic cerebral palsy is 55% of that of bone, that is to say, the muscle of the affected limb can not grow proportionally with the bone, so the patient grows with the growth of the affected limb will be shorter and shorter than the normal side of the limb, and the lower limbs with different lengths will usually appear claudication, tilting of the pelvis, and scoliosis when there is a difference of more than 2cm between the limbs. The patient needs to be operated actively, otherwise, when the child is bigger, even after the operation to reduce the muscle tone, the situation of different length of the lower limbs still can not be improved. 2.No obvious joint contracture and deformation. If the child has obvious joint contracture and deformation, surgery can also be given to reduce muscle tone, and then consider the second phase of lower limb orthopedics, combined with postoperative rehabilitation training. Improve the patient’s mobility. 3.For those patients who do not have a certain degree of preoperative mobility, if the child has intolerable spasmodic pain, hip adduction affecting bowel movement and care, progressive aggravation of joint contracture under the action of lower limb muscle tension, or severe torsion, obviously affecting the patient’s life, can also be improved through the FSPR surgery to improve the symptoms and care, and to improve the patient’s quality of life.