Abstract: Objective: To explore the mural coronary artery in diastole late, according to law, and analyze the mural coronary artery in the middle of the early diastole, the degree of stenosis and MB coronary artery overall form as well as the correlation between the occurrence of atherosclerosis. Materials and methods: 754 cases of clinical suspected coronary heart disease(CHD) patients with coronary artery CT imaging, the independent workstation multilane reconstruction(MPR, CPR) blood vessels and myocardial spatial relationships, confirm the completeness of the myocardial bridge, in the judgment and the morphology of mural coronary artery: observation on the MPR like coronary take line all the way, and grouping, measuring wall in the reorganization of intracavitary imaging of coronary artery stenosis degree, and t test between the two groups. According to MCA proximal presence of plaque formation is divided into patches and plaques group, the mural coronary artery stenosis degree respectively independent sample t test between the two groups. The plaque group and the probability of occurrence of plaque composition Angle give four table chi-square test. Results: In a total of 754 subjects found in 81 cases of complete myocardial bridge. According to the MB thickness, can be divided into two groups: > 2 mm group and ≤ 2 mm group. t test results between the two groups have statistically significant differences(P < 0.05). The MB coronary artery course circuity, direction normal diastolic MCA stenosis degree is serious. Plaque and plaque group t test results between the two groups have statistically significant differences(P < 0.05). Plaque group and the Angle of circuitous probability table chi-square four grids has statistically significant difference(P < 0.05). Patients in 81 cases of ECG, analysis of its static circuity-angulation group electrocardiogram ST-T period of change and the rate of angina pectoris occurred was obviously higher than that of normal group. Conclusion: The myocardial bridge could cause the development of atherosclerotic lesions. Diastolic MCA stenosis degree and load MB proximal coronary artery overall direction and presence of atherosclerotic plaques, circuity-angulation diastolic stenosis degree is greater than the normal group. Proximal have plaque diastolic more narrow than no plaque group. MCA proximal plaques, as a result of atherosclerosis, are more likely to happen as Angle circuity. Circuity angulation group client static ECG ST-T segment changes as well as the incidence of angina pectoris were higher than that of smooth arc group.