The focus of cardiac ultrasound and cardiac CT is different, looking at the structure of the heart ultrasound is accurate, and looking at cardiac vascular CT is accurate. Cardiac ultrasound examination is mainly the heart structure, including the size of the atria and ventricles, the heart valves with or without stenosis and closure insufficiency, the atrial septum, the ventricular septum with or without defects, the septum, the ventricular wall thickness is normal or not, whether the heart systolic and diastolic function is normal or not. It is an important test for diagnosing heart failure. It is not possible to observe whether there is any narrowing or blockage of the blood vessels of the heart. Cardiac CT mainly examines the condition of the heart blood vessels, i.e. coronary arteries, including the alignment of the coronary arteries, the presence of plaque and the degree of stenosis, which is significant for the diagnosis of coronary heart disease. Look at the heart structure, function of the heart color ultrasound is more accurate than CT, look at the heart blood vessels with or without stenosis CT is more accurate than color ultrasound.