Normal children’s creatine kinase should be controlled within the range of 24~195U/L. If the value exceeds 10 times of the normal value, it is a more serious situation, and it is generally considered that there is cardiomyocyte damage. Creatine kinase is highest in skeletal muscle and cardiac muscle, mainly involved in muscle contraction and energy regeneration and other physiological processes, if children have high values of creatine kinase, more than the normal value, usually suggests the existence of myocardial injury. Generally speaking, if the children’s short-term exercise is high, it may lead to the creatine kinase level exceeding 24U/L, which is a normal high value, and will not cause obvious impact on the growth and development of children, so there is no need to worry too much, and it is only necessary to control the amount of exercise. If the level is more than 10 times the normal value, which is a more serious situation, then consider the existence of myocarditis. The performance of myocarditis is not typical, usually manifested as breathlessness, chest tightness and chest pain, etc. It is recommended to go to the regular hospital for further treatment. After clarifying the cause of the disease, then under the guidance of the doctor for treatment.