Some patients with coronary artery disease are not recommended to have stenting for the following reasons: mild scope and degree of coronary artery lesions, poor physical conditions, allergy to contrast medium, etc. 1. The scope and degree of coronary artery disease is light: when coronary angiography is performed, coronary artery stenosis is found to be not serious during the operation, and the degree of stenosis is less than 70%, then there is no need to put a stent, and the patient can be treated with medication first. 2. Poor physical condition: To put a stent in coronary artery disease, it is necessary to evaluate the patient’s condition. If the physical condition is poor and cannot tolerate the operation, the doctor will not recommend the operation to put a stent due to the high risk of the operation. 3. Allergy to contrast agent: Coronary artery disease stenting, the prerequisite for this operation is the need for coronary angiography, if the patient is allergic to the contrast agent, then the examination can not be completed, and stent implantation surgery can not be completed. Coronary heart disease patients need to be specific in the hospital after consultation with the doctor in charge of communication, to further clarify the situation.