Abstract: Objective: To identify the causes of recurrence of myocardial ischemia and treatment after CABG. Methods: Performing coronary angiograme to Seventy-four patients with recurrence of myocardial ischemia after CABG.Result: Of the patients, there were seventy-two males and two females. The average age was（ 63.39.3） years. The average duration from CAG to CABG was （37.7937.65） months. There were 44 LIMA grafts126 SV grafts and 4 radial grafts total. LIMA total occlusive rate was 20.5%, stenotic rate was 18.2%. Stenosis and total occlusion was found in 7.9% and 40.5% respectively of the SV graft. Two-fourth of radial grafts has stenotic lesions. Competitive flow was found in 12.2% of the patients, the worsened native coronary arteries in 17.6% and incomplete revascularization in 13.5%. 1 patient has wrong graft site. The main causes of myocardial ischemia was graft lesions. The successful rate graft vessels PCI was 90%.Conclusion: The main causes of ischemia was graft lesions and graft PCI with stenosis lesions showed a higher successful rate.