Creatine kinase isoenzyme belongs to a kind of cardiac enzyme, which mainly exists in the heart. If phosphocreatine kinase isoenzyme is elevated, it indicates that there may be diseases of myocardial necrosis, such as myocarditis, myocardial infarction, etc. Through the examination of phosphocreatine kinase isoenzyme, we can diagnose cardiac necrosis as early as possible, and strive for timely treatment to reduce the possibility of hair saving danger, and if it is a heart attack, it can be detected early to prevent further emergence of Heart failure, progressive heart enlargement and other diseases. In addition, if the phosphocreatine kinase isoenzyme exceeds the normal index, the larger the area of myocardial infarction or myocardial necrosis, if the creatine kinase is not high and only the creatine kinase isoenzyme is elevated, there may be laboratory errors or the patient is a tumor patient. If the creatine kinase is not high and only the creatine kinase isoenzyme is elevated, there may be a laboratory error or the patient may have a tumor.