Left ventricular hypocontractility is mainly diagnosed by cardiac ultrasound, electrocardiography, myocardial enzyme profile, coronary CTA or coronary angiography. 1. Cardiac ultrasound: it can not only check the structure and morphology of the heart, but also evaluate the cardiac function. The evaluation of cardiac function mainly depends on the left ventricular ejection fraction, under normal circumstances, the left ventricular ejection fraction is between 50 and 70%, and less than 50% suggests cardiac insufficiency. Besides, cardiac ultrasound can also clarify the heart structure and valve problems. 2. Electrocardiography: It can check whether the electrophysiology of the heart is normal or not. Various types of arrhythmias such as atrial fibrillation, paroxysmal supraventricular tachycardia, atrioventricular block, etc. may affect the contractile function of the left ventricle in a greater or lesser degree. 3. Myocardial enzyme profile: Myocardial enzyme profile can reflect myocardial damage, abnormal myocardial enzyme profile often suggests cardiac insufficiency, myocardial infarction, myocarditis and so on. 4. Coronary CTA and coronary angiography: it can confirm the diagnosis of coronary heart disease and check the specific narrowing of the coronary artery, which can provide the basis for the follow-up treatment, and stent implantation can be carried out at the same time of coronary angiography. It should be noted that some non-cardiovascular diseases may also affect cardiac function, such as hyperthyroidism, chronic anemia, etc., which need to be examined according to the symptoms of the disease. If left ventricular hypocontractility occurs, please consult the hospital in time and standardize the diagnosis and treatment under the guidance of the doctor to avoid delaying the condition.