Carotid artery epicraniectomy: It is the removal of the sympathetic bundle around the common carotid artery. Possible principles: 1) increase the central response threshold and regulate brainstem function; 2) regulate the function of the organs innervated by autonomic nerves; 3) reduce the release of “excitotoxin”; 4) increase cerebral blood flow; 5) cause local neuroendocrine and central neurotransmitter changes; 5) sympathetic nerves are involved in muscle tone or interact with motor nerves. Improvement of symptoms: 1, different degrees of swallowing or speech impairment; 2, salivation and strabismus; 3, tension spastic paralysis; 4, involuntary movements such as torsion spasms and tachycardia; 5, reduction of muscle tone; 7, improvement of manual dexterity and stabilization of sitting posture; 8, improvement of digestive tract function. Brain science research confirms that there is a critical period in the process of brain development, during which the brain has a strong ability to adapt and reorganize both structurally and functionally, and the establishment of brain function during the critical period is easier than establishing function after the brain matures. For example, the critical period for human language learning is generally before the age of 5-6 years. The changeability and compensatory nature of the brain is less likely to improve with increasing age, and carotid epicardial dissection is therefore more effective the younger the child is.