Cardiac stenting is a minimally invasive intervention for the treatment of coronary artery disease, and should not be performed with more than 3 stents at most. Cardiac stenting is a common surgical procedure for the treatment of coronary atherosclerotic heart disease, the specific placement of a few stents should be based on the actual condition of the patient to determine, if the patient’s coronary artery stenosis is serious, can be put into more than one stent treatment, the general patient into 1 ~ 2 can relieve the condition, the most should not be more than 3. Before the cardiac stent surgery, various indexes should be examined, and the contrast agent will affect the kidney function, so patients with bad kidney function should be cautious to do the surgery. If the patient’s coronary artery stenosis is serious and multiple stents need to be put in, it should be prudent to judge whether the interventional surgery or coronary artery bypass grafting surgery can benefit the patient the most. It is recommended to choose the most suitable treatment for the patient under the guidance of professional doctors to avoid affecting the condition.