The risk of cardiac stent surgery is divided into the following cases: 1. Patients combined with other diseases, for example, patients combined with renal insufficiency, do stent at the same time may have to use contrast agents, causing a high possibility of contrast nephropathy. At the same time, the patient may have oliguria, anuria, renal failure, and need emergency dialysis. Generally, it may cause economic burden to the patient and will not cause the death of the patient; 2, combined with other systemic diseases, such as bleeding disease, the patient has to use a lot of anticoagulation and antiplatelet drugs when doing stenting. If the patient has a high risk of bleeding, such as the combination of chronic kidney disease, the patient has a history of hypertension, cerebral aneurysm, gastrointestinal bleeding, the risk of bleeding may be high, the most serious for cerebral hemorrhage, and for patients at high risk of cerebral hemorrhage to pay attention to, such as a previous history of stroke, elderly, female, low weight conditions, the risk of bleeding will be very high; 3, there may be risks during the surgical operation. This is related to the patient’s coronary lesions, such as calcification, angulation, tortuosity, and chronic occlusion, which may cause great difficulties in the operation and may cause bleeding and perforation during the operation, causing danger to the patient’s life; 4. Emergency interventions for myocardial infarction may often result in entrapment, slow flow, no recurrent flow, or even cardiac perforation or rupture, which may also cause great impact on the patient’s life. Therefore, the risks of patients in interventional treatment can be divided into the above categories.