Indications for coronary artery surgery: 1. Left coronary artery trunk lesion stenosis >50%. 2.Stenosis of the proximal segment of the left anterior descending branch and gyrus branch greater than or equal to 70%. 3.3-branch coronary artery lesion with left ventricular ejection fraction less than or equal to 50%. 4.Stable angina is not responding well to medical treatment, affecting work and life. 5.Severe ventricular arrhythmias with left main or 3-branch lesions. 6, Failure of interventional therapy still has angina or abnormal hemodynamics. Indications for mitral valve replacement: 1, severe leaflet and subvalvular structural calcification, malformation, and inappropriate separation. 2, mitral valve stenosis combined with obvious mitral valve closure insufficiency.