Intervention and bypass are two important tools in the treatment of cardiovascular diseases. Among them, stents, especially drug stents, as a latecomer, have been favored by many patients for their minimal invasiveness. According to the New York Times on Feb. 25, the number of patients receiving bypass in the United States in 2006 was about 365,000, down 1/3 from 10 years ago, while the number of patients receiving interventions soared all the way to about 1 million. But the article also points out: many cardiovascular specialists urge that, despite this, people should not ignore the advantages of bypass surgery in favor of interventions. So, which of the two is more important? Under what circumstances should a patient undergo surgical bypass surgery? 1. Left main stem lesion: According to the domestic and international guidelines, surgery is the first choice for left main stem lesion. This is because a blockage or restenosis of the left main stem can be fatal if it occurs. In order to narrow the risk, bypass is the best choice. 2. Three branch lesions: There are more lesions vessels, and if interventional treatment is chosen, many stents have to be placed, which will greatly increase the chance of restenosis and thrombosis. Moreover, the economic burden of patients is also higher. 3. Patients with cardiac insufficiency: such patients need complete hemodynamic reconstruction to promote the recovery of ischemic myocardium, which is difficult to do with intervention. 4.Patients with diabetes mellitus: common stent has a high restenosis rate for diabetic patients, while drug stent has been introduced for a short time, and there is no clear evidence that interventional treatment will have better efficacy than bypass. 5, patients with post-myocardial infarction complications of coronary artery disease: ventricular rupture, septal perforation, mitral valve closure insufficiency, etc. must be treated with surgical bypass surgery.