1. Patients who need to clarify the presence or absence of coronary artery disease. Including people with symptoms of myocardial ischemia but no evidence of myocardial ischemia and patients with electrocardiographic changes of myocardial ischemia but no conscious symptoms. 2.Clinical diagnosis of coronary artery disease is very clear, in order to rationally choose drugs, stents, bypass and other treatment methods for patients. This type of patients need to perform coronary angiography to evaluate the vascular lesions to guide the choice of treatment program. 3.Patients who need to evaluate whether the treatment is effective and assess the prognosis. Whether the patient is prone to sudden death and infarction in the future and other issues of concern to patients with coronary artery disease can be used to understand the lesion site, degree of stenosis, stability and other lesion information to guide the doctor’s judgment on the prognosis; many patients after active lifestyle changes and active drug treatment of self-consciousness symptoms have improved significantly, it can also be used to review the imaging to determine the lesion progression, whether the patient’s self-perception of progress. This can also be done by reviewing the imaging to determine whether the lesion has progressed and whether it is as good as the patient feels.