To detect cardiovascular disease, we need to rely on clinical symptoms, physical examination and ancillary tests to confirm the diagnosis of cardiovascular disease through the above three ways. Clinical symptoms include many specific manifestations, if the patient shows chest tightness and chest pain, it may be coronary atherosclerotic heart disease. If the patient shows palpitations it may be arrhythmia, and if the patient shows dyspnea it may be heart failure. Cardiac ultrasound can detect the presence of heart failure and cardiomyopathy, electrocardiogram can detect the presence of coronary artery disease or arrhythmia, coronary angiography can clarify the presence and severity of coronary artery disease, and cardiac MRI is the best way to confirm the diagnosis of cardiomyopathy. Blood tests can determine the presence of myocardial damage or dyslipidemia. Physical examination is mainly cardiac auscultation, which can clarify the presence of heart murmurs and heart rate.