After the diagnosis of coronary heart disease is clear and the doctor knows the condition of coronary artery stenosis, the most appropriate treatment plan can be formulated. There are only three most common treatments: medication, stent placement, and bypass surgery. If the stenosis is mild, medication is sufficient; if the stenosis is severe, it depends on which method works faster, is less invasive, and has a longer-lasting effect. Both stenting and bypass surgery can have an immediate effect at the very beginning of treatment. Patients experience less trauma with stent placement, but stents do not keep the vessel open as long as bypass surgery. Patients often do not have a sense of the difference before they receive treatment, but it is not difficult to find the difference by comparison. The long-term patency rate of the best available stent is equivalent to bypassing a vein with the lowest patency rate in the human body for the same successful procedure. The biggest disadvantage of bypass surgery, however, is that its treatment is the most traumatic, requiring a recovery period of about three months. At this time, patients are often left with no choice. There is both a desire to obtain the best possible outcome and a desire to reduce the pain associated with the treatment. In fact, doctors have a certain consensus among domestic and foreign experts to develop appropriate treatment plans for different degrees of the condition. If the vessel is 100% blocked in a short time, the “criminal vessel” should be opened under coronary angiography as soon as possible; 2. If the stenosis is severe and there are many branches that need to be treated (more than 2 stents need to be placed), it should be treated by bypass surgery; 4. If the stenosis is in a major coronary artery (left main stem and its vicinity), it can only be treated by bypass surgery. 5. If the patient is weak or has other conditions that prevent him from tolerating the surgery, the diseased vessel can also be partially improved by stenting the blood supply.