Coronary angiography is the most authoritative standard for diagnosing coronary artery disease, which can make a clear diagnosis of the degree of coronary artery sclerosis, the extent of plaque and the nature of lesions, and play a good guiding role in clinical treatment. The total cost of coronary angiography is relatively expensive, about 5,000 yuan, and the cost includes preoperative tests, such as coagulation, blood routine, biochemical functions, chest X-ray, B ultrasound, CT and other tests. Cardiac coronary angiography is a relatively mature and minimally invasive test, in which contrast is injected from a microcatheter under local anesthesia, and the stenosis and plaque of the artery can be clearly shown under X-ray. This test will have some bleeding, but will not affect the health, and is not a routine test. For myocardial infarction or angina pectoris, consider the need for stenting before doing it.