How long a patient can live with 90% conservative treatment of cardiovascular stenosis depends on the patient’s treatment and individual factors, and should be analyzed on a case-by-case basis, not as a generalization. Patients with 90% cardiovascular stenosis are in a more serious condition and can suffer acute myocardial infarction at any time, with the possibility of death. If the patient only takes conservative treatment, the treatment effect is poor and angina pectoris may occur repeatedly or even acute heart infarction, causing heart failure, arrhythmia and other conditions, which may be life-threatening at any time, but the specific survival time varies from person to person. Patients are advised to actively perform coronary stenting or coronary artery bypass grafting to relieve symptoms in combination with stenosis. At the same time, regular postoperative medications for anti-platelet aggregation, lipid regulation and plaque stabilization are likely to lead to long-term survival. In conclusion, patients with 90% of heart stenosis should pay attention to control blood pressure, blood sugar and blood lipids, quit smoking and alcohol, and take aspirin and statins as prescribed by the doctor in their daily life.