Aim to investigate the diagnostic value of 64 CT angiography in determining myocardial bridge(MB) and mural coronary artery(MCA).Methods 1 422 patients were underwent 64 CT angiography.The CTA data were post-processed and reconstructed in the work-station.All the cases with MB were submitted to CAG studies.The length,thickness of MB and the stenoses of MCA were recorded for study.The results of CT and DSA were compared and analyzed finally.Results 104 cases with 119 MB segments were found in the study,with mean length 5.0±2.7 mm,mean thickness 2.0 1.6 mm.The mean stenosis rate of MC is 31%±17%.42 cases with 44 MB segments were found by DSA study.The length and thickness were statistically deferent from CT results.Conclusion CTA can clearly characterize MB and MCA,and has important clinical values.