The best way to check heart disease is as follows: 1. congenital heart disease: basic examination items include electrocardiogram, cardiac ultrasound, chest X-ray, among which cardiac ultrasound examination can clearly observe the patient’s heart structure and determine whether there is abnormal shunt, which is a better examination method; 2. acquired heart disease: basic examination items include electrocardiogram, 24-hour ambulatory electrocardiogram, cardiac enzymes, thyroid function and other Hormone tests, echocardiography, etc. Further cardiac catheterization, radionuclide or CT examination can be performed. For pediatric patients with arrhythmia, conduction block, or premature beats, a 24-hour ECG is the preferred method.