Myotonia causes: The tension of the muscle at rest and relaxed state is called myotonia, which is the basis for maintaining various postures of the body and normal movement, and people with high myotonia may show abnormal postures both in movement and at rest. There are three main clinical factors regarding the causes of hypertonia. First, abnormal brain development caused by various reasons can lead to increased muscle tone; second, low weight infants (less than 2500g), including premature immature infants, and full-term small-like infants, are also the main causes of high muscle tone. In addition, brain injury caused by neonatal cranial injury, brain infection, etc. may contribute to high muscle tone. The grading of muscle tone: Any kind of disease has its developmental process, and the condition will become more and more serious as time goes by, and the increase of muscle tone also has its developmental process and its grade distinction, which is mainly divided into 6 categories. Grade 0: normal muscle tone; Grade 1: slightly increased muscle tone: passive flexion and extension of the affected part shows minimal resistance at the end of the range of motion of the joint, or sudden jamming and sudden release; Grade 1+: mildly increased muscle tone: sudden jamming at 50% of the range of motion of the joint, then minimal resistance at 50% of the range of motion of the joint; Grade 2: more markedly increased muscle tone: through the joint Grade 3: Severe increase in myotonia: difficulty in passive movement; Grade 4: Rigidity: passive flexion and extension of the affected part with rigidity and immobility. Surgical treatment of muscle tone: peripheral nerve narrowing, which has an exact effect on single group of muscle spasm, can be precise to each bundle of nerves innervating muscle contraction, and has no effect on the muscle strength of normal muscles, with excellent surgical results; selective posterior spinal nerve root dissection, which can achieve a comprehensive adjustment of muscle tone, and can improve the patient’s muscle spasm pain in a long-term, stable manner, creating conditions for greater recovery of their motor function . Carotid sympathetic nerve net stripping is effective in the treatment of tardive dyskinesia (involuntary movement type) and ataxic cerebral palsy. The surgical improvement of the focal area, combined with postoperative rehabilitation, allows the child with cerebral palsy to have enhanced coordination and flexibility.