Myocarditis in children is commonly infectious, especially viral myocarditis, and is characterized by a long course and easy recurrence. The onset of the disease is related to infection and autoimmunity, and it is common to have symptoms such as tachypnea (long breath), weakness, pallor, excessive sweating, palpitations, shortness of breath, chest tightness, dizziness, precordial pain, and cold hands and feet. At present, most of the integrated prevention and treatment measures of Chinese and Western medicine are adopted, including the selection of Chinese herbal medicine for multiple identification, symptomatic treatment, anti-infection treatment, nutrition of myocardium and improvement of myocardial metabolism, correction of arrhythmia, and regulation of immune function. Rest is very important in the acute stage. In mild cases, rest should be paid attention to and no strenuous activities. Those with general conditions should rest for at least 1 month or 3-4 weeks after the fever subsides. Those with cardiac insufficiency and enlarged heart should emphasize bed rest for 3-6 months, and then start gradual activities when the condition improves and the heart shrinks significantly. During the recovery period, immunomodulatory therapy should be added in a timely manner, and more evidence-based herbs and tui na should be used. Long breath during myocarditis is a manifestation of insufficient cardiac function. The mechanism is the weakness of myocardial contraction and the occasional reduction of cardiac ejection, resulting in transient pulmonary blood depression, which reflexively causes lung expansion, manifested by deep inspiration, followed by lung contraction, which manifests as long outgassing. The main treatment is to nourish the heart muscle and improve the heart function, Chinese medicine mostly use compound preparations containing astragalus and ginseng, which have good efficacy in treating with evidence. The treatment should pay attention to eating more vegetables and fruits, and pay attention to rest, avoid strenuous activities, avoid overeating to reduce the burden on the heart. The prognosis for myocarditis in children is mostly good, but some children may have intractable arrhythmias. After the condition has stabilized, you can do moderate activities and exercise, but you should start gradually, with small amounts, and do not do strenuous exercise to avoid excessive fatigue. Regular review and follow-up should be done at the hospital, and if there is another cold or gastroenteritis, timely treatment and rest must be taken to prevent recurrence of myocarditis.