Heart blockage 90% without stent can be, but under the guidance of the physician regular treatment. Whether stenosis 90% without stenting depends on the stenosis site, patient symptoms, signs and other comprehensive judgment. If it is the proximal anterior descending branch or the left main stem lesion, it is life-threatening not to put a stent. If the stenosis is small branch opening, or distal stenosis, no symptoms can be observed with medication. Patients with severe stenosis without stent implantation should take regular oral aspirin, atorvastatin and other drugs, and if there are obvious symptoms, they should take isosorbide nitrate orally to expand the coronary arteries, avoid the development of angina and prevent the occurrence of myocardial infarction. Coronary heart disease patients should be under the guidance of the doctor regular oral medication to avoid aggravation of the condition.