Scientists in the past 10 years have confirmed that dilated heart disease is mainly due to persistent viral infection and autoimmune response, and information shows that about 12.5% of acute viral myocarditis can be transformed into dilated cardiomyopathy in clinical practice. The annual mortality rate of myocardial disease is 25-45%, and the promotion of education and military service are restricted, and also bring heavy economic and psychological burden to the family, therefore, effective prevention and treatment of “myocarditis” is of great significance. Who should be suspected of having cardiomyopathy? Cardiomyopathy is characterized by impaired dilatation and systolic function of the left ventricle or both ventricles, with a slow onset that can occur at any age, mainly due to an enlarged heart and reduced systolic function. Patients with a history of chronic myocarditis, family history, or history of recurrent viral infections: such as cold, herpes zoster, or hepatitis B. The main symptoms are chest tightness and shortness of breath, palpitations, weakness, cough, dyspnea, abdominal distention, bilateral lower limb edema, and arrhythmias, etc. Cardiomyopathy should be suspected when four or more of these symptoms are present. Echocardiography shows significant enlargement of the heart chambers, ECG shows diverse and variable arrhythmias, ST-T changes, etc.