Objective To evaluate the differences of between superficial myocardial bridge-mural coronary artery (MB-MCA) and deep MB-MCA with the morphological characteristics of MB-MCA and the incidence of coronary atherosclerosis. Methods The images of 122 patients who were diagnosed as MB-MCA by128-MSCT were analyzed.The length of MCA and thickness of MB and the stenosis rate of MCA were measured and calculated, and situation of MB, encasement form of MCA, adjacent vessel morphology and the distribution of atherosclerosis were observed. x2 test and t test were used to analyze measurement data between the superior MB-MCA and deep MBMCA. Results 138 sites of MB-MCA were detected in 122 cases. superficial, deep MBMCA in each accounted for 69.57% (96/138) and 69.57% (42/138), average length of MCA were 22.77±13.97mm and 23.07±12.40mm, MCA average stenosis degree were 19.94±13.64% and 26.62±16.47% respectively, alone or at the same time on both ends of the MCA tortuousity accounted for 86.46% and 86.46% respectively. MCA stenosis degree between the two type was statistically significant (P=0.0143). The overall prevalence of coronary atherosclerosis of the proximate segment of MB-MCA was 44.2%, which demonstrated significant difference with atherosclerosis of MCA itself and the distal segment, The incidence of atherosclerosis in each segment between two type was no statistical difference (P>0.05). Conclusion MCA stenosis degree is associated with the type of MB-MCA.MB-MCA predisposes to the development of atherosclerosis in its proximate coronary artery, which is unrelated to the type of MB-MCA.