Heart failure does not have three major indicators, and can be diagnosed comprehensively through ejection fraction, brain natriuretic peptide BNP, chest X-ray and other examination methods. 1. Ejection fraction: the ejection fraction of the heart per minute per contraction is measured by echocardiography, which can reflect the systolic and diastolic function of the heart, and the ejection fraction of a normal person in a quiet state is generally around 55%~65%. 2. Brain natriuretic peptide (BNP): BNP index will increase after heart failure, and with the aggravation of heart failure, BNP index will continue to rise. 3. Chest X-ray: Chest X-ray can be used to observe whether there is pulmonary edema, pulmonary stasis and the enlargement of the heart. Through the above three methods of examination, patients can clarify the degree of heart failure, and timely treatment.