Abstract: Objective To study the feasibility to replace simple common coronary angiography（CCA）with computed tomography coronary angiography（CTCA）. Methods A total of 568 patients with their greatest coronary artery stricture≤50%,as shown at simple CCA in our department from June 16,2007 to June 17,2008,were enrolled in this study.Of the 568 patients,102 underwent CTCA within 1 month after admission.The findings at CTCA and CCA were compared. Results Eighty patients underwent simple CCA,19 patients were checked after stenting,and 3 patients were reexamined after coronary artery bypass grafting（CABG）.Diagnostic errors of CCA and CTCA were found in 8 and 19 patients with a diagnostic rate of 92.2%and 84.2%,respectively. Conclusion CTCA can accurately determine patients who do not need revascularization including those after stenting and is,therefore,of an important value in clinical practice.