Coronary heart disease refers to a heart disease in which the coronary arteries, the blood vessels supplying the heart, undergo severe atheromatous plaque proliferation or combined with thrombosis, resulting in narrowing and obstruction of the lumen, causing insufficient blood supply to the coronary arteries, myocardial ischemia or necrosis. Depending on the degree of vascular obstruction, the clinical manifestations of coronary artery disease include angina pectoris, myocardial infarction, arrhythmia, heart failure and even cardiac arrest. In the past, due to the low popularity of coronary angiography, the diagnosis of coronary heart disease was mostly inferred from clinical manifestations, which was more subjective and less accurate, and even for those patients with panic, chest tightness, vague pain and/or combined with hypertension and diabetes, the patient was given the title of “coronary heart disease” without the corresponding examination, and given Musk Heart Pill, Danshen Tablet, and Anti-heartburn Tablet. This is extremely unscientific and does not meet the requirements of today’s evidence-based medical development. In recent years, as people’s understanding of coronary heart disease and the level of diagnosis and treatment continue to improve, especially the progress of interventional examination and treatment of coronary heart disease is more prominent. Coronary angiography has become one of the “golden indicators” for the diagnosis of coronary heart disease. Coronary angiography can not only determine the presence and severity of coronary artery blockage, but also provide the basis for the next treatment plan. For example, patients with mild symptoms, occasional attacks, mild coronary artery stenosis and good drug therapy should be treated mainly with drugs; while patients with worsening symptoms, frequent attacks, severe coronary artery stenosis, or patients with myocardial infarction caused by blockage of blood vessels should receive interventional treatment to open blood vessels or surgical bypass surgery. Therefore, all patients who have chest pain and suffocation after activity should go to the hospital for coronary angiography as soon as possible to exclude or clarify coronary artery disease, so as not to delay the disease and cause more damage. Coronary angiography is a very safe and effective screening tool. No incision is required. Under local anesthesia, a special catheter is only inserted through the femoral artery of the thigh or radial artery of the upper limb to the opening of the coronary artery, and contrast is selectively injected into the coronary artery to record the process of visualization. The examination usually takes only 15-30 minutes, and the patient can go to the floor after lying down for 12-24 hours after the procedure, regardless of age or gender, and most patients can accept it. It has gradually become a more routine examination tool. For patients with severe coronary artery stenosis diagnosed by coronary angiography, intracoronary balloon angioplasty, known as PTCA, can be performed depending on the situation. Based on coronary angiography, a catheter with a balloon at the front end is delivered to the diseased part of the coronary artery, and the balloon is inflated with pressure to dilate the stenotic lesion. Afterwards, a stent is implanted in the coronary artery to permanently open the lesion, thereby improving myocardial blood supply, relieving symptoms, improving the patient’s quality of life, and reducing the rate of death. In general, the incidence of serious complications directly caused by the procedure is less than 1%, which means that the procedure can be performed safely in more than 99% of patients.