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Objective: To investigate the correlation of cardiac magnetic resonance imaging (MRI) in the assessment of myocardial activity in patients with myocardial infarction and the outcome of cardiac function after PCI. Methods: 30 patients with myocardial infarction (MI) who had complete clinical and imaging data from July 2016 to December 2018 after PCI were analyzed retrospectively. MR and echocardiogram were performed before and 6 months after PCI, and the parameters related to left ventricular function were measured by post-processing software of MRI workstation. The left ventricular transmural degree of CMR late gadolinium enhancement was compared with the left ventricular wall motion degree of 6-month echocardiography as a standard to judge the viable myocardium. Result: There were 193 left ventricular segmental abnormalities in 30 cases, including 121 viable myocardium and 72 non viable myocardium in CMR-LGE before operation. Six months after PCI, echocardiography showed that 125 of 193 abnormal segments of left ventricle detected by CMR-LGE before PCI were viable myocardium and 68 were non viable myocaridium.The sensitivity and specificity of CMR-LGE to determinate of viable myocardium were 92.0％ and 91.1％ respectively. The larger the non-viable myocardial area of the left ventricular wall, the worse the recovery of wall motion ability, and there was a negative correlation between them (r=0.416, P<0.05). The first-pass perfusion time in CMR-LEG region was significantly longer than that in normal myocardial region (4.85 (+) 1.51) s and (3.79 (+) 1.73) s, respectively. The difference was statistically significant (t = 5.191, P < 0.05). Conclusion: MRI can evaluate the myocardial activity of myocardial infarction, reflect the range of viable myocardium, and provide imaging basis for clinical treatment and prognosis.