PCI refers to a group of percutaneous interventional procedures, mainly applied in the treatment of coronary heart disease, which includes percutaneous balloon coronary angioplasty, coronary stent implantation, and atheromatous plaque ablation techniques, etc., and is now used as the main means of coronary heart disease treatment. Its selection is mainly based on the patient’s coronary artery stenosis, and its restenosis and the formation of intra-stent thrombus are the main factors affecting its efficacy after PCI, while anti-platelet aggregation drugs should be applied after PCI according to the situation. PCI not only improves the quality of life, but also significantly reduces the incidence of myocardial infarction and mortality.