Coronary stenting is considered successful in the true sense only when the following three criteria are met: 1. Angiographic success: significant lumen enlargement at the stenosis site after stenting, lumen diameter residual stenosis less than 20%, and TIMI flow grade 3. 2.Operational success: the patient meets the criteria for successful angiography and there are no important clinical complications such as death, myocardial infarction, or emergency target lesion hemodynamic reconstruction during hospitalization. 3. Clinical success: (1) Immediate clinical success: the operation is successful and the patient recovers with remission of myocardial ischemic symptoms and signs; (2) Long-term clinical success: the effect of immediate clinical success is maintained for a long time and the remission of myocardial ischemic symptoms and signs continues for more than 6 months. After recent clinical success, restenosis cannot be considered a complication, but a response to vascular injury.