Inclusion Criteria:  Patients with chest pain aged ≥18 years old, regardless of gender; Coronary angiography shows a solitary myocardial bridge with systolic diameter stenosis ≥30% in LAD; Have the ability to complete an ECG exercise test; Sign informed consent and are willing to participate in the intended study.  Exclusion Criteria:  Patients with acute coronary syndrome; Coronary angiography shows that the diameter of atherosclerosis in the non-myocardial bridge area of LAD is ≥30%; RCA or LCX has severe fixed stenosis, diameter stenosis ≥70% or FFR<0.75, and no interventional therapy is accepted; Hypertrophic obstructive cardiomyopathy or more than moderate heart valve disease; Atrial fibrillation or severe slow or rapid arrhythmia; Heart failure with NYHA ≥ Grade III; Uncontrolled hypertension or systolic blood pressure <100mmHg; Asthma or severe chronic obstructive pulmonary disease; Severe liver and kidney dysfunction; Allergic to contrast agents.