Right coronary artery proximal stenosis 90% serious, belongs to the severe stenosis, mostly considered the existence of coronary heart disease, visible symptoms of angina, shortness of breath, etc., generally timely treatment has a better prognosis. Usually, the right coronary artery proximal stenosis 90% is serious, the blood vessels have belonged to the severe narrowing, in the clinic is mostly considered to be coronary heart disease, and coronary artery atherosclerosis related. Most patients have no obvious clinical symptoms in the early stage of the disease, but with the gradual aggravation of stenosis, patients will experience angina pectoris, shortness of breath, chest tightness, palpitations (rapid heartbeat, often accompanied by panic), dyspnea and other discomforts. In addition, patients are also susceptible to complications such as heart failure, arrhythmia and insufficient blood supply to the brain. Although it is difficult to recover from severe stenosis, the condition can be controlled with standardized treatment in a timely manner, which improves the patient’s quality of life, reduces the risk of other serious conditions, and results in a better prognosis. In conclusion, patients with 90% stenosis of the proximal right coronary artery need to cooperate with their doctors to avoid delaying their condition.