Cardiography has certain risks, including: anesthesia risk, contrast agent risk, puncture risk, cardiovascular and cerebrovascular accidents, and so on. 1. Anesthesia risk: Cardiac imaging mainly uses local anesthesia, but there is a risk of allergy to anesthetics and anaphylaxis, which needs to be reduced through anesthesia evaluation and monitoring by anesthesiologists. 2. Risk of contrast agent: The contrast agent is a synthetic compound of iodine, which may have the risk of allergy to contrast agent and affecting renal function, etc. The incidence is relatively low, and renal function assessment is needed to clarify before the examination. 3. Risk of puncture: the contrast examination needs to puncture the artery through the right wrist, which may lead to arterial spasm, aneurysm, bleeding, hematoma, etc. Postoperative monitoring and local pressure bandage are needed to reduce the risk of bleeding and so on. 4. Cardiovascular and cerebrovascular accidents: cardiac arrhythmia, pulmonary edema, cerebral infarction and cerebral hemorrhage may be induced during the examination, but the probability of occurrence is low. Cardiography is an invasive test, there is a certain risk, but the test can clarify the situation of coronary artery stenosis, if necessary, can also be directly stent implantation treatment, it is recommended that patients follow the doctor’s instructions to actively cooperate with the examination and treatment.