Coronary angiography is coronary angiography, which is an effective method of diagnosing coronary artery disease. Coronary angiography is an examination means to visualize the coronary arteries by injecting a contrast agent into the coronary arteries. It can observe the morphology of the coronary arteries and clearly reveal the anatomical deformities of the coronary arteries and the location, degree and extent of their obstructive lesions, and it is the gold standard for the clinical diagnosis of coronary heart disease. Coronary angiography is an invasive interventional test, which is not only used for the diagnosis of coronary artery disease, but also can be used to guide the treatment, such as percutaneous coronary angioplasty. After the procedure, the patient should strictly follow the doctor’s instructions to monitor the cardiac electricity and blood pressure, and pay attention to whether the wound is oozing blood. In addition, patients should drink plenty of water to accelerate the excretion of contrast medium. Patients with coronary artery disease should follow the doctor’s instructions and have regular checkups, and consult a doctor if they feel unwell.