The treatment of coronary heart disease has gradually increased with the development of stenting technology, and the efficacy has also been improving. 1, the examination methods of coronary heart disease There are more examination methods of coronary heart disease, the more common clinical methods are electrocardiogram, dynamic electrocardiogram, exercise plate test, coronary CTA, myocardial nuclear scan and coronary angiography. Among them, coronary CTA and coronary angiography are the ultimate examination methods to clarify vascular lesions, which require the use of contrast agents. Coronary CTA is mostly used to clarify the condition of patients with a small possibility of coronary artery disease, and coronary angiography (CAG) is required for high-risk patients. It is generally believed that the 12-year survival rate is 91% for patients with normal angiography, 74% for single-branch lesions, 59% for two-branch lesions and 50% for three-branch lesions, with poor prognosis for left main trunk lesions and significantly lower survival rate for left anterior descending branch disease. 3, understanding of stent implantation Stent implantation therapy is considered in most patients with stable angina when the symptoms are still not relieved by drug therapy and the lesion reaches the degree of stenosis for stent implantation. Some patients either think that stents cannot be installed, and once they are installed in a few years, they have to continue to be installed; or they think that stents must be installed once they have a coronary angiogram; in fact, in patients with angina pectoris, standard anti-anginal therapy can be tried after a definitive angiogram, and if the symptoms are relieved, they can continue to take medication without stent implantation, because stents do not reduce the mortality of patients, but only to relieve symptoms. Stenting in patients with acute myocardial infarction requires active and early coronary angiography, and the fastest time to open the occluded vessels, the earlier the vessels are opened, the more the patient will benefit, but the risk of surgery is also greater at this time, but if not treated as early as possible, the effect of later medication is very poor. After stent implantation, medication is required to eliminate or inhibit the risk factors associated with coronary artery disease, and also to prevent late thrombosis within the treatment. Generally, for simple lesions of coronary arteries, dual antiplatelet therapy can be adjusted after surgery, but for complex lesions, medication needs to be guided by a clinician according to the condition, and must not be stopped by oneself. Regular and timely follow-up is required after surgery, and contact needs to be established with the surgeon to guide review and medication use.